Rog J.

asked • 04/12/16

To the nearest tenth of square inch, find the area of the regular pentagon whose apothem measures 4.2 inches and whose sides measure 6.2 inches.

Geometry Question

1 Expert Answer

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Mark M. answered • 04/12/16

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Draw and label of diagram!
Five triangles make up the pentagon.
The area of each is (0.5)(side)(apothem)
The area of the pentagon is 5(0.5)(side)(apothem)
Substitute values and calculate
 
This is an example of the formula:
A = (0.5)(perimeter)(apothem)
A = pa/2
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