Textbook

Back to basics: this unit is about the basic stuff that everyone supposedly knows:

- Do you know the area formulas for all common quadrilaterals?
- Can you easily work out the angles of arbitrarily large regular polygons?
- How about counting their diagonals?

**Example**

What’s the measurement of the interior angle of a $12$-gon?

(spoiler)

If you used the formula, then you get full credit. Good enough.

But if you *also* wanted style points for cleverness, then you divided the sum of the exterior angles (always $360_{o}$) by $12$ to get that the exterior angles measure $30_{o}$ each, and thus the interior angles measure $150_{o}$ each.

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