Help on a math problem!

Test Preparation SAT Preparation
1

<p>Its number 5 on this website: <a href="http://www.vanillabreeze.net/sat/MATH%201-3%20web.pdf%5B/url%5D"&gt;http://www.vanillabreeze.net/sat/MATH%201-3%20web.pdf&lt;/a&gt;&lt;/p>

<p>I'm thinking theres a easy way to do it since its only number 5 on the test.
Please someone help me out!</p>

2

<p>The answer is 15pi</p>

3

<p>how did you get that answer? Please explain?</p>

4

<p>Flip the 1/2 circle wth S center onto the other one OR move the two 1/2 circle to make RS the diameter. Regardless of the options you pick, you end up with a circle with a diameter of RS. </p>

<p>Circumference of a circle is diameter * Pi. In this case that means 15Pi.</p>