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

And because it’s isosceles, the two base angles are going to be congruent. So we could say 31 degrees plus 31 degrees plus the measure of angle ABC is equal to degrees. And we are done. This is the other leg right over there. Example 3 Find the value of JL. So this angle right over here is degrees. So you get 62 plus 62 plus the blue angle, which is the measure of angle BCD, is going to have to be equal to degrees.

About project SlidePlayer Terms of Service. And the vertex angle right here is 90 degrees. Isosceles Triangle A triangle with at least two congruent sides. Registration Forgot your password? So it’s an equilateral triangle, which means all of the angles are equal. So this is going to be 62 degrees, as well.

The two congruent legs form. It also has two congruent angles. This is one leg. You get x is equal to 45 degrees.

Well, this angle right over here is supplementary to that degrees.

# Isosceles and Equilateral Triangles Lesson Presentation – ppt download

This leg is equal to that leg. And we’ll do it the exact same way we just did that second part of that problem. Isosceles Triangle A triangle with at least equolateral congruent sides.

So you call that an x.

## 4-8 Isosceles and Equilateral Triangles Lesson Presentation

This is degrees. And because it’s isosceles, the two base angles are going to be congruent. So this right over here is 62 degrees.

Don’t I need to know two other sides? Every isosceles triangle is equilateral.

## Isosceles & equilateral triangles problems

The third side is the base. So let me draw that for us.

Astronomy Application The length of YX is 20 feet. Example 3 Find the value of JL. The third side is the. So it’s an equilateral triangle, which means all of the angles are equal. Isosceles Triangles At least two sides are of equal length. And solviny again, we know it’s isosceles because this side, segment BD, is equal to segment DE.

And once again, these two angles plus this angle right over here are going to have to add up to degrees. Well, the base angles are going to be congruent.

You get degrees. Did I do that right?

Or we could also call that DC. You subtract another 2. Isosceles and Equilateral Triangles Section BC has the same length as CD. Feedback Privacy Policy Feedback. Equilaheral you get 2x plus– let me just write it out.

# Isosceles & equilateral triangles problems (video) | Khan Academy

You call that an x. So sokving two base angles are going to be congruent. Don’t want to skip steps here. You can kind of imagine it was turned upside down. And to do that, we can see that we’re actually dealing with an isosceles triangle kind of tipped over to the left.