1. ________________________________________________
Reflection 9.1
Only one unit left to go! Based on what you’ve learned about yourself (and me) this year, give (at least) three pieces of advice for next year’s Geometry students.
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Tell me anything and everything that you know about circles!

2. Unit 9: Circles
Target 9.1
Find arc measures (10.2)

3. An angle that is formed by two ________________ of a circle is called a central angle.
The arc that is formed can either be a…
________________
The measure of an arc is __________________ the measure of the central angle.

4. Identify the given arc as a minor arc, major arc, or semicircle
Identify the given arc as a minor arc, major arc, or semicircle. Then, find the measure of the arc.
Note that RT is a diameter of the circle.

5. The bridge shown creates an arc when it is moved from the closed position to the open position. Find the measure of the arc.
The bridge opens at a rate of 20 degrees per minute. How long will it take the bridge to be fully opened (as shown above)?

6. Two arcs are considered ______________________ if…
They have the same _______________ and
They are arcs of the same (or congruent) ______________.
Tell whether the red arcs are congruent. Explain why or why not.

7. A circle has five radii drawn in it such that all five central angles that are formed are congruent. What is the measure of each arc that is formed?
What is the sum of the measures of three of these arcs?