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The radius of a circle is 4 centimeters. What is the area of a sector bounded by a 180° arc?Give the exact answer in simplest form._____ square centimeters.

The radius of a circle is 4 centimeters. What is the area of a sector bounded by a-example-1

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An area bounded by a 180° arc represents half the circle, as 180° is half the total circumference (360°).

Then, if the radius is 4 cm, we can caculate the green area as:


\begin{gathered} A=(180)/(360)A_c=(1)/(2)A_c=(1)/(2)(\pi r^2) \\ A=(1)/(2)\pi(4)^2 \\ A=(1)/(2)\pi\cdot16 \\ A=8\pi \end{gathered}

Answer: the area is 8π square centimeters.

User Jeffrey Mixon
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