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A rectangle is placed around a semicircle as shown below. The length of the rectangle is 18mm . Find the area of the shaded region. Use the value 3.14 for π , and do not round your answer. Be sure to include the correct unit in your answer.



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A rectangle is placed around a semicircle as shown below The length of the rectangle is 18mm Find the area of the shaded region Use the value 314 for π and do n class=
A rectangle is placed around a semicircle as shown below The length of the rectangle is 18mm Find the area of the shaded region Use the value 314 for π and do n class=

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perixwinkle
In the picture, it is a semicircle, so you have to remember to divide the area by 2.
The diameter of the circle is 18, so the radius is 9. Using the formula, I'll find the area.
9²π=81π= 254.34÷2= 127.17
Now finding the radius actually help, because that semicircle's height is its radius, which is 9.
18 ×9 = 162
Now I'm going to find the shaded area.
162 - 127.17 = 34.83 mm²

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