Why is n 2180

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Use the Advanced search. Document R Help Print this page. Expand all Collapse all. Please scroll down to see the correct answer and solution guide. It's true that it's confusing. If you're drawing the triangles all coming from the center, the thing to realize is that the n-2 isn't because there are n-2 triangles. There are clearly n triangles when you draw it out that way.

Instead, the -2 comes out of the math. Let's consider what happens when you draw these triangles. They all come out from one point in the center, n in total. We know that can't be the right value for the sum of the interior angles because we can see that each triangle has one of its corners at the center.