# LESSON 4-8 PROBLEM SOLVING ISOSCELES AND EQUILATERAL TRIANGLES

So it’s an equilateral triangle, which means all of the angles are equal. Corresponding angles in congruent triangles. Well, the base angles are going to be congruent. Angle ABE is going to be 60 plus 45, which is degrees. The vertex angle is the angle formed by the legs. Astronomy Application The length of YX is 20 feet. And the trick here is like, wait, how do I figure out one side of a triangle if I only know one other side? You get the measure of angle ABC is equal to– let’s see. We think you have liked this presentation. Find each angle measure. Finding angles in isosceles triangles example 2. And then– I won’t skip steps here. Let me just write it like this.

Isosceles Triangles The congruent sides triang,es an isosceles triangles are called it legs. A triangle with two congruent sides. You get x is equal to 72 degrees. Well, if we know two of the angles in a triangle, we can always figure out the third angle. Now, we iossceles do either of these. If this is an isosceles triangle, which we know it is, then this angle is going to be equal to that angle there. Did I do that right?

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## Isosceles & equilateral triangles problems

Auth with social network: You subtract from both sides. So the two base angles are going to be congruent. The angle created by the intersection of the legs is.

So this right over here is 62 degrees. Don’t I need to know two other sides?

Isosceles, Equilateral, and Right Triangles Sec 4. Example 3 Find the value of JL. And in particular, we see that triangle ABD, all of its sides are equal. And we get x plus x plus 36 degrees is equal to So it’s going to be this whole angle, which is what we care about. Video transcript Let’s 48- some example problems using our newly acquired knowledge of isosceles and equilateral triangles.

This is the other base angle. I have an isosceles triangle.

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

You’ve got x plus x plus 90 is going to be degrees. Or divide both sides by 2. So we could say 31 degrees plus 31 degrees plus the measure of angle ABC is equal to degrees. These two characters– let’s see. Apply properties of isosceles and equilateral truangles. 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. It also has two congruent angles.

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So first of all, we see that triangle ABC is isosceles. And the trick here is like, wait, how do I figure out one side of a triangle if I only know one other side? So we know that this angle right over here is also 31 degrees. So this is equal to 56 degrees. Finding angles in isosceles triangles.

Share buttons are a little bit lower. Feedback Privacy Policy Feedback. You get x is equal to 45 degrees. We think you have liked this presentation.