# math

A semi-circle sits on top of a rectangle to form the figure below. Find its area and perimeter. Use for 3.14.

The rectangle is 4 inches long and 3 inches wide. The semi-circle sits on top of the rectangle on a side that is 4 inches long.

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1. area = the rectangle + half the circle
= 3*4 + (1/2)π(2^2)
= 12 + 2π in^2
= ...

perimeter, (I guess we are not counting the one length)
= 2+4+3+(1/2)2π(2)
= 9 + 2π inches
= ...

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Reiny
2. semi circle
perimeter = 2 pi r/2 = pi r = pi * 2 in
area = (1/2) pi r^2 = (1/2) pi * 4 = pi * 2 in^2
rectangle
bottom = 4 in and 2 sides of 3 in each
perimeter = 4 + 2*3 = 10 in
area = 4*3 = 12 in^2
so
perimeter = 10 + 2 pi
area = 12 + 2 pi

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Damon
3. go with Damon's perimeter,

I did not pick up my typo, had 2+4+3+(1/2)2π(2)

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Reiny
4. What’s the answer what’s the area and perimeter

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