## Part 1: Understanding Triangles

Welcome to the first installment of our SAT preparation series on Triangles, brought to you by MKSprep, your trusted SAT preparation center in the heart of Kathmandu, Nepal. In this section, we’ll lay the groundwork for understanding triangles’ essential elements and properties, a key topic on the SAT Math exam.

### What is a Triangle?

A triangle is a three-sided polygon, one of the most basic shapes in geometry. Despite its simplicity, triangles hold many intriguing properties, making them a fascinating topic to explore.

### Elements of a Triangle

Each triangle has three sides, three angles, and three vertices. The sum of the lengths of any two sides of a triangle is always greater than the length of the third side. This is known as the triangle inequality theorem.

Similarly, the sum of the three interior angles of a triangle always equals 180 degrees, regardless of the shape of the triangle. This is a fundamental property you’ll find handy in many geometry problems on the SAT.

### Types of Triangles

Triangles can be categorized based on their sides and angles:

1. Based on Sides:
• Equilateral Triangle: All sides are equal.
• Isosceles Triangle: Two sides are equal.
• Scalene Triangle: No sides are equal.
1. Based on Angles:
• Acute Triangle: All angles less than 90 degrees.
• Right Triangle: One angle is exactly 90 degrees.
• Obtuse Triangle: One angle is more than 90 degrees.

Understanding these basic properties and types of triangles sets a solid foundation for the more advanced concepts that we’ll delve into in the subsequent parts of this series.

[Next: Properties of Special Triangles]

## Part 2: Properties of Special Triangles

Greetings from MKSprep, your premier SAT preparation center in Kathmandu, Nepal. We’re here with the second installment of our series on Triangles, a crucial topic for the SAT Math section. In this part, we’ll delve into the properties of special triangles.

### Isosceles Triangles

In an isosceles triangle, two sides are of equal length, and the angles opposite these sides are equal. This is known as the base angles theorem. It’s an essential concept in many geometry problems.

### Equilateral Triangles

In an equilateral triangle, all sides and all angles are equal. Each angle measures 60 degrees. This property of equilateral triangles simplifies many SAT problems involving such triangles.

### Right Triangles

Right triangles are triangles that have one 90-degree angle. The side opposite the right angle is the hypotenuse, the triangle’s longest side. The Pythagorean Theorem, a^2 + b^2 = c^2, where c is the length of the hypotenuse, and a and b are the lengths of the other two sides, is a key property of right triangles.

### Special Right Triangles

Two types of special right triangles often appear on the SAT:

1. The 45-45-90 Triangle: In this triangle, the angles measure 45, 45, and 90 degrees. The sides are in the ratio of 1:1:√2, with the hypotenuse being √2 times the length of each leg.
2. The 30-60-90 Triangle: In this triangle, the angles measure 30, 60, and 90 degrees. The sides are in the ratio of 1:√3:2, with the hypotenuse being twice the length of the shortest side.

Understanding these special triangles and their properties will provide a significant advantage in efficiently solving various SAT geometry problems.

Stay tuned for our next installment, where we’ll discuss the triangle congruence and similarity concept!

## Part 3: Triangle Congruence and Similarity

Welcome back to our SAT preparation series on Triangles from MKSprep, your reliable SAT preparation center in Putalisadak, Kathmandu, Nepal. For the third part of this series, we are diving into the concepts of triangle congruence and similarity, crucial aspects of mastering for the SAT Math section.

### Triangle Congruence

Two triangles are congruent if their corresponding sides and angles are equal. There are several ways to prove triangle congruence, and you’ll often see these methods referred to as postulates or theorems:

1. Side-Side-Side (SSS) Congruence: If all three sides of one triangle are equal to the corresponding sides of another triangle, the two triangles are congruent.
2. Side-Angle-Side (SAS) Congruence: If two sides and the included angle of one triangle are equal to the corresponding two sides and included angle of another triangle, the two triangles are congruent.
3. Angle-Side-Angle (ASA) Congruence: If two angles and the included side of one triangle are equal to the corresponding two angles and included side of another triangle, the two triangles are congruent.

### Triangle Similarity

Two triangles are similar if their corresponding angles are equal and their corresponding sides are in proportion. This means that the triangles are the same shape but not necessarily the same size. There are three ways to prove triangle similarity:

1. Angle-Angle (AA) Similarity: If two angles of one triangle are equal to two angles of another triangle, the triangles are similar.
2. Side-Angle-Side (SAS) Similarity: If two sides of one triangle are proportional to two sides of another triangle, and their included angles are equal, then the triangles are similar.
3. Side-Side-Side (SSS) Similarity: If all three sides of one triangle are proportional to the corresponding sides of another triangle, then the triangles are similar.

Understanding triangle congruence and similarity is pivotal in solving many SAT Math problems. Stay tuned for our next part, where we’ll dive deeper into the exciting world of triangle properties!

## Part 4: Triangle Inequality Theorem and Exterior Angle Theorem

Welcome back to MKSprep’s SAT preparation series on Triangles. We are your dedicated SAT preparation center in Putalisadak, Kathmandu, Nepal. In this fourth part, we’ll explore the Triangle Inequality Theorem and the Exterior Angle Theorem – two essential principles in triangle geometry for the SAT Math section.

### Triangle Inequality Theorem

The Triangle Inequality Theorem states that the sum of the lengths of any two sides of a triangle is always greater than the length of the third side. This theorem is valuable when you’re trying to determine if a set of given lengths can form a triangle or when you’re asked to find possible values for the length of a side of a triangle.

### Exterior Angle Theorem

The Exterior Angle Theorem is another important concept. This theorem says that the measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles. For example, suppose you have a triangle with interior angles of 30, 60, and 90 degrees and extend one of the sides to form an exterior angle. In that case, that angle’s measure will be the sum of the measures of the other two interior angles. This theorem is extremely useful when dealing with problems related to angle measures in a triangle.

Remember, understanding and applying these theorems will simplify many SAT Math problems involving triangles. Join us for our next part, where we’ll discuss the Pythagorean theorem and its application in triangles!

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## Part 5: The Pythagorean Theorem

Greetings again from MKSprep, your trusted SAT preparation center based in Putalisadak, Kathmandu, Nepal. We’re now at the fifth part of our SAT prep series on Triangles. Today will focus on the Pythagorean theorem – a fundamental concept involving right triangles that you’ll encounter in the SAT Math section.

### The Pythagorean Theorem

The Pythagorean theorem is a principle in geometry that applies specifically to right triangles, which are triangles that have one 90-degree angle. This theorem states that in a right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides. This can be written as:

a² + b² = c²

where:

• c represents the length of the hypotenuse,
• a and b represent the lengths of the other two sides.

The Pythagorean theorem is frequently used in SAT Math problems, and understanding it thoroughly can help simplify many geometry problems. It is particularly useful when you’re asked to calculate the length of a side in a right triangle, determine whether a triangle is right-angled, or solve real-world problems involving right triangles.

Stay tuned for the next part of this series, where we’ll explore special types of triangles and their unique properties. MKSprep is dedicated to making sure you’re well-prepared for every aspect of the SAT!

## Part 6: Special Types of Triangles

Hello again from MKSprep, your dedicated SAT preparation center based in Putalisadak, Kathmandu, Nepal. Today, in the sixth part of our SAT course series on Triangles, we’ll discuss special types of triangles – Equilateral, Isosceles, and Scalene – each with unique properties and rules.

### Equilateral Triangles

An equilateral triangle is a triangle where all three sides have equal length, and all three angles are each 60 degrees. This uniformity can simplify calculations involving side lengths and angles.

### Isosceles Triangles

An isosceles triangle is a triangle that has at least two sides of equal length. The base angles of an isosceles triangle – the angles opposite these equal sides – are also equal. Isosceles triangles often appear in SAT questions that involve symmetry or require an understanding of equal angles and sides.

### Scalene Triangles

A scalene triangle is a triangle that has no sides of equal length and no angles of equal measure. While scalene triangles do not have the inherent symmetry of isosceles or equilateral triangles, they often appear in questions involving the Pythagorean theorem or area calculations.

Understanding these special types of triangles and their properties can greatly aid in simplifying SAT Math problems. In our next installment, we’ll be examining how to calculate the area and perimeter of triangles. Stay tuned!

## Part 7: Area and Perimeter of Triangles

Welcome back to MKSprep’s SAT preparation series, the leading SAT prep center in Putalisadak, Kathmandu, Nepal. In this seventh part of our series on Triangles, we’ll delve into two important aspects – the area and perimeter of triangles.

### Calculating the Perimeter of a Triangle

The perimeter of a triangle is the sum of the lengths of all its sides. In SAT problems, you might be given the lengths of the sides directly, or you may need to use other geometric principles (like the Pythagorean theorem for right triangles) to find missing side lengths.

### Calculating the Area of a Triangle

The area of a triangle is found using the formula:

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Area = 1/2 * base * height

In this formula, the ‘base’ is any side of the triangle, and the ‘height’ is the perpendicular line drawn from the base to the opposite vertex. Understanding how to apply this formula is vital for a variety of SAT problems. In some cases, you might have to rearrange the formula to find the base or height if the area and one other measurement are given.

In our next and final part, we’ll discuss the trigonometric ratios in right-angled triangles, which are very helpful for solving various SAT Math problems. Stay connected!

## Part 8: Trigonometric Ratios in Right-Angled Triangles

Hello once more from MKSprep, your trusted SAT preparation center in Putalisadak, Kathmandu, Nepal. As we conclude our series on Triangles, we’ll be exploring the trigonometric ratios in right-angled triangles – a key concept for the SAT math section.

### Introduction to Trigonometric Ratios

Trigonometric ratios are relationships between the angles and sides of right-angled triangles. The three primary trigonometric ratios are sine (sin), cosine (cos), and tangent (tan). They are defined as follows for a given angle θ in a right triangle:

• sin(θ) = opposite side / hypotenuse
• cos(θ) = adjacent side / hypotenuse
• tan(θ) = opposite side / adjacent side

In SAT math, you might be required to find an unknown side length in a right-angled triangle given an angle and the length of another side, or you may need to find an angle given the lengths of two sides. Familiarity with these trigonometric ratios will help you tackle these problems effectively.

### SOHCAHTOA

An easy way to remember the definitions of the trigonometric ratios is the mnemonic SOHCAHTOA:

• Sine = Opposite / Hypotenuse (SOH)
• Cosine = Adjacent / Hypotenuse (CAH)
• Tangent = Opposite / Adjacent (TOA)

With this, we wrap up our detailed exploration of Triangles for SAT preparation. Consistent practice is key to mastering these concepts and performing well on your SAT. At MKSprep, we are always ready to assist you on your journey towards SAT success!