Name the parts of. Every isosceles triangle is equilateral. Well, the base angles are going to be congruent. I have to figure out B. 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. Registration Forgot your password?

And we’ll do it the exact same way we just did that second part of that problem. So you get 2x plus– let me just write it out. Video transcript Let’s do some example problems using our newly acquired knowledge of isosceles and equilateral triangles. I have an isosceles triangle. So this is equal to 56 degrees. 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.

And so if we call this x, then this is x as well.

So equilatsral of these characters are going to be 60 degrees. Or divide both sides by 2. You subtract 62 from both sides. You call that an x. So this is going to be 62 degrees, as well. We have x plus x plus 90 is going to be equal to degrees.

## Isosceles & equilateral triangles problems

This leg is equal to that leg. Registration Forgot your password? Feedback Privacy Policy Feedback. Prbolem is the other base angle. We think you have liked this presentation. So this right over here is 62 degrees. So you get 62 plus 62 plus the blue an, which is the measure of angle BCD, is going to have to be equal to degrees. This is the vertex angle. Isosceles Triangle A triangle with at least two congruent sides.

Equilateral triangles Isosceles triangles. Divide both sides by 2. And in particular, we see that triangle ABD, all of its sides are equal. The vertex angle is the angle formed isoscelfs the legs. You subtract another 2. It also has two congruent angles. Apply properties of isosceles.

To use this website, you must agree to our Privacy Policyincluding cookie policy. Let me just write it like this. So this is equal to 72 degrees. So that angle plus is going to be equal to This is one pfoblem angle.

So you get 2x plus– let me just write it out. You get 2x is equal to Bottom left corner at 0,0rest of coordinates at 2, 00, 2 and 2, 2 9.

Find angles in isosceles triangles. Video transcript Let’s do some example problems using our newly acquired knowledge of isosceles and equilateral triangles.

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

The third side is the base. Now, this angle is one of the base angles for triangle BCD. This is the vertex.