### Home > GC > Chapter 10 > Lesson 10.1.2 > Problem 10-19

10-19.

For each of the geometric relationships represented below, write and solve an equation for the given variable. For parts (a) and (b), assume that is the center of the circle. Show all work.

Since both are radii,

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The measure of the central angle is twice the measure of the inscribed angle. So

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How are the sides of a right triangle related?

What is the total sum of the angles of this polygon?