From the course: Test Prep: GRE

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Triangles

Triangles

From the course: Test Prep: GRE

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Triangles

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- [Voiceover] One of the most common shapes you're going to see in GRE geometry questions is the triangle. So there's few facts about triangles I want you to know. Let's start with equilateral triangles. So, equilateral triangles have sides that are all the same length. And a lot of times we put little lines in the middle of each side to indicate that. And, their angles are also all equivalent. So, their angles are all equal to 60 degrees. Remember, in any triangle, 180 degrees is the sum of interior angles. So, equilateral triangles look like this, and if you know a triangle is equilateral, you know that each side has the same length and each angle is 60 degrees. Isosceles triangles are triangles with two equal sides. So, I'll just make an example of one here. Let's say this angle is 70 and then this angle is 70. So this top angle would have to be 40. And we know that since these angles are equal on the bottom two parts of the triangle, then the sides opposite those angles are also…

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