richardlong369
Geometry question Need Some Help Please
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richardlong369
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Here is the problem

Mertsj
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Is it correct to assume that the pentagon is tangent to the circle at 5 points?

richardlong369
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yes

Mertsj
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dw:1339274429124:dw

Mertsj
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So a side of the pentagon is 26.16 and the area of the pentagon is 1/2(18)(130.8)=1177.2

Mertsj
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The area of the circle is pi(18)^2=1017.88

Mertsj
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The area of the shaded part is the difference of the two.

richardlong369
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so A= 1017.88

Mertsj
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What is the area of the pentagon?

richardlong369
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1177.2

Mertsj
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What is the area of the circle?

richardlong369
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1017.8

Mertsj
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How would you find the area of the shaded part?

richardlong369
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1017.88 minus 1177.2

Mertsj
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sutract the little one from the big one.

richardlong369
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so 1177.7 minus 1017.88

Mertsj
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yep