![]() ![]() There are three different kinds of triangles: scalene (all side lengths and angles are different) isosceles (two sides and angles are the same) and equilateral (all three sides are the same length, and all angles are 60 degrees each. Triangles are polygons with three sides the sum of their interior angles add up to 180 degrees. Let’s talk about some of the more common shapes on the GRE geometry section and how to deal with them. Add a third line and you've got a shape called a triangle. If the two lines meet at a right angle, they are called perpendicular if the two lines run next to each other and will never meet, they're called parallel (do not assume that lines on the test are perpendicular or parallel unless the problem states that they are!). ![]() Add another line, and where the two meet is called an angle. On the GRE, all lines that appear straight are straight. Lines are infinitely thin, infinitely long series of points. That's all geometry is: lines, angles, and shapes (it's coming back to you, isn't it?). Let's review what you'll need to know about triangles for the GRE. The bad news is that you may have forgotten a lot of what you learned in those classes. The good news is that the GRE usually doesn't test any concepts you wouldn't have learned in high school. If you're like most students preparing to take the GRE, you haven’t taken a math class in a few years. ![]()
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