| 1. | The picture below shows the sonar screen for a submarine. It detects other submarines in the area.
If the radius of the screen represents 20 miles, what is the area of the ocean that the sonar reads?
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| a) | 62.8 square miles |
| b) | 251.2 square miles |
| c) | 400 square miles |
| d) | 1,256 square miles |