### LESSON 4-8 PROBLEM SOLVING ISOSCELES AND EQUILATERAL TRIANGLES

Bottom left corner at 0,0 , rest of coordinates at 2, 0 , 0, 2 and 2, 2 9. Those are the two legs of an isosceles triangle. Every equilateral triangle is isosceles. Isosceles, Equilateral, and Right Triangles Sec 4. You get x is equal to 72 degrees. Auth with social network:

Did I do that right? So what is the measure of angle ABE? Example 3 Find the value of JL. So we could say 31 degrees plus 31 degrees plus the measure of angle ABC is equal to degrees. So let me draw that for us. Explain why the length of YZ is the same.

And because it’s isosceles, the two base angles are going to be congruent. So we have a bunch of congruent segments here. So what is the measure of angle ABE?

## Isosceles & equilateral triangles problems

Isosceles Triangles At least two sides are of equal length. You call that an x.

And we are done. This is the other leg right over there.

## 4-8 Isosceles and Equilateral Triangles Lesson Presentation

This right here is 62 degrees. You get x is equal to 72 degrees. Did I do that right? You get the measure of angle ABC is equal to– let’s see. A triangle with two congruent sides.

Using Properties of Equilateral Triangles Find the value of y. Well, that’s part of angle ABE, but we have to figure out this other part right over here. Isosceles, Equilateral, and Right Triangles Sec 4. The angle created by the intersection of the legs is. The vertex angle is the angle formed anf the legs.

Published by Francis Manning Modified over 3 years ago.

The side opposite the vertex angle is called the base, and the base angles are the two angles that have the base as a side. I didn’t draw it that way, but this side and this side are congruent. About project SlidePlayer Terms of Service. You subtract another 2. You get the measure of angle BCD is equal to– let’s see.

Let’s do this one right over here. Well, this angle right over here is supplementary to that degrees.

Subtract 36 from both sides, we get 2x– that 2 looks a little bit funny. To log in and use all the features of Khan Academy, please enable JavaScript in your browser.

Finding angles in isosceles triangles. And then finally, if you want to figure out this blue angle, the blue angle plus these two degree angles are going to have to add up to degrees.

Every equilateral triangle is isosceles.

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# Isosceles and Equilateral Triangles Lesson Presentation – ppt download

This one looks a little bit simpler. So this angle right over here is degrees. You subtract 62 from both sides.