Help on a math problem!

Test Preparation SAT Preparation
1

<p>Its number 5 on this website: <a href=“永新诹悔信息科技有限公司”>永新诹悔信息科技有限公司;

<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>