# Homework 3 Isosceles And Equilateral Triangles Answers: Practice and Review

## Homework 3 Isosceles And Equilateral Triangles Answers: A Comprehensive Review

If you are looking for homework 3 isosceles and equilateral triangles answers, you have come to the right place. In this article, we will review the key concepts and skills that you need to solve problems involving isosceles and equilateral triangles. We will also provide you with some examples and solutions from homework 3 geometry assignment for isosceles and equilateral triangles. By the end of this article, you will be able to master this topic and ace your homework.

## Homework 3 Isosceles And Equilateral Triangles Answers

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## What are Isosceles and Equilateral Triangles?

Before we dive into the homework 3 isosceles and equilateral triangles answers, let's first review what are isosceles and equilateral triangles. These are two special types of triangles that have some properties that make them different from other triangles.

An isosceles triangle is a triangle that has at least two congruent sides and two congruent angles. The congruent sides are called the legs, and the angle between them is called the vertex angle. The third side, which is opposite to the vertex angle, is called the base. The angles at the base are called the base angles.

An equilateral triangle is a triangle that has all three sides congruent and all three angles congruent. Each angle measures 60 degrees. An equilateral triangle is also an isosceles triangle, since it has two (or more) congruent sides and angles.

## What are the Properties of Isosceles and Equilateral Triangles?

Isosceles and equilateral triangles have some properties that can help us solve problems involving them. Here are some of the most important ones:

The Isosceles Triangle Theorem: If two sides of a triangle are congruent, then the angles opposite to them are congruent.

The Converse of the Isosceles Triangle Theorem: If two angles of a triangle are congruent, then the sides opposite to them are congruent.

The Equilateral Triangle Theorem: If a triangle is equilateral, then it is also equiangular (all angles are congruent).

The Converse of the Equilateral Triangle Theorem: If a triangle is equiangular (all angles are congruent), then it is also equilateral (all sides are congruent).

## How to Solve Problems with Isosceles and Equilateral Triangles?

To solve problems with isosceles and equilateral triangles, we need to use the properties above, as well as some other tools such as the Triangle Angle Sum Theorem (the sum of the measures of the angles of a triangle is 180 degrees), the Segment Addition Postulate (if a point lies on a segment, then the sum of the lengths of the two subsegments is equal to the length of the whole segment), and algebraic techniques such as substitution, simplification, and solving equations.

Here are some steps that can help us solve problems with isosceles and equilateral triangles:

Identify what type of triangle you have: Look for clues such as markings or given information that indicate whether you have an isosceles or an equilateral triangle.

Apply the appropriate properties: Use the properties of isosceles and equilateral triangles to find missing information such as side lengths or angle measures.

Use other tools as needed: Use other tools such as the Triangle Angle Sum Theorem, the Segment Addition Postulate, or algebraic techniques to find more missing information or to check your answers.

## Homework 3 Isosceles And Equilateral Triangles Answers: Examples and Solutions

To help you understand how to solve problems with isosceles and equilateral triangles, we will provide you with some examples and solutions from homework 3 geometry assignment for isosceles and equilateral triangles. We will use the steps above to explain how we got each answer.

Example 1: Looking at ΔDEF, which statement below is true?

Solution: We can see that ΔDEF has two congruent sides marked with one hash mark each. This means that ΔDEF is an isosceles triangle. By applying the Isosceles Triangle Theorem, we can conclude that the angles opposite to these sides are also congruent. Therefore, D F. This means that statement A) D F is true.

Example 2: Find the value of x.

Solution: We can see that ΔABC has three congruent sides marked with three hash marks each. This means that ΔABC is an equilateral triangle. By applying the Equilateral Triangle Theorem, we can conclude that ΔABC is also equiangular (all angles are congruent). Therefore, A B C. Since each angle measures x degrees, we can use the Triangle Angle Sum Theorem to find x. We have:

x + x + x = 180

3x = 180

x = 180/3

x = 60

The value of x is 60 degrees.

Example 3: The measures of two of the sides of an equilateral triangle are 3x+15 in. and 7x-5 in. What is the measure of the third side in inches?

Solution: We know that an equilateral triangle has all three sides congruent. Therefore, we can set up an equation using the Segment Addition Postulate to find x. We have:

(3x+15) + (7x-5) = s

s = s

(3x+15) + (7x-5) = s

10x + 10 = s

x + 1 = s/10

x = s/10 - 1

To find s, we need to plug in x into one of the expressions for a side length. We can use either one, but we will use 3x+15 for simplicity. We have:

s = 3(s/10 - 1) + 15

s = (3s/10 - 3) + 15

s = (3s/10 + 12)

s - (3s/10) = 12

(7s/10) = 12

s = (12*10)/7

s = 120/7

The measure of the third side in inches is 120/7 inches.

## Conclusion

In this article, we have reviewed homework 3 isosceles and equilateral triangles answers. We have explained what are isosceles and equilateral triangles, what are their properties, how to solve problems with them, and provided some examples and solutions from homework 3 geometry assignment for isosceles and equilateral triangles. We hope this article has helped you understand this topic better and prepare for your homework.

## How to Check Your Homework 3 Isosceles And Equilateral Triangles Answers?

After you have completed your homework 3 isosceles and equilateral triangles answers, you might want to check your work and make sure you have done everything correctly. There are several ways you can do this:

Use online tools: You can use online tools such as calculators, solvers, or checkers that can help you find or verify your answers. For example, you can use this online calculator to find the missing side or angle of an isosceles or equilateral triangle:

__https://www.calculator.net/triangle-calculator.html__. You can also use this online solver to find the steps and solutions for any problem involving isosceles or equilateral triangles:__https://www.symbolab.com/solver/isosceles-triangle-calculator__.

Use your textbook or notes: You can use your textbook or notes as a reference and compare your answers with the examples or exercises given there. You can also look for hints, tips, or explanations that can help you understand the concepts and methods better.