SOLUTION: The radius of a circle is 5 kilometers. What is the area of a sector bounded by a 180° arc?

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Question 734028: The radius of a circle is 5 kilometers. What is the area of a sector bounded by a 180° arc?
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!
The radius of a circle is r=5km.
the area of a sector bounded by a 180° arc is equal 1%2F2 of area of the full circle or equal to a semicircle area
A=%281%2F2%29r%5E2%2Api%29
A=%281%2F2%29%285km%29%5E2%2Api%29
A=%281%2F2%2925%2Api%2Akm%5E2%29
A=12.5%2Api%2Akm%5E2%29