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

This one looks a little bit simpler. The vertex angle is the angle formed by the legs. To use this website, you must agree to our Privacy Policy , including cookie policy. And we are done. And we need to figure out this orange angle right over here and this blue angle right over here. Apply properties of isosceles. Video transcript Let’s do some example problems using our newly acquired knowledge of isosceles and equilateral triangles.

So let me draw that for us. Now, we could do either of these. And in particular, we see that triangle ABD, all of its sides are equal. You get x is equal to 45 degrees. Find angles in congruent triangles.

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

So this right over here is 62 degrees. To make this website work, we log user data and share it with processors. Definitions – Review Define an isosceles triangle. Or divide both sides by 2. It also has two congruent angles.

And we’ll do it the exact same way we just did that second part of that problem. Anv is one base angle. So it’s going to be this whole angle, which is what we care about.

So this is equal to 72 degrees. About project SlidePlayer Terms of Service. To equilatsral in and use all the features of Khan Academy, please enable JavaScript in your browser. Math High school geometry Congruence Working with triangles. You call that an x. So they haven’t even drawn segment BE here.

## 4-8 Isosceles and Equilateral Triangles Lesson Presentation

And if all of the angles are equal in a triangle, they all have to be 60 degrees. Subtract 36 from both sides, we get 2x– that 2 looks a little bit funny.

So this angle right over here is degrees. The two x’s, when you add them up, you get 2x. Published by Francis Manning Modified over 3 years ago. Those are the two legs of an isosceles triangle. So that angle plus is going to be equal to This is one leg. Now, we could do either of these. Let me just write it like this.

So over here, I have kind of a triangle within a triangle. 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.

We think you dolving liked this presentation. Let’s do this one right over here. Now, this angle is one of the base angles for triangle BCD.

# Isosceles and Equilateral Triangles Lesson Presentation – ppt download

Don’t I need to know two other sides? Don’t want to skip steps here. Video transcript Let’s do some example problems using our newly acquired knowledge of isosceles and equilateral triangles. And in particular, we see that triangle ABD, all of its sides are equal.

You subtract from both sides. A triangle with two congruent sides.