14-12-2015
Mathematics

contestada

Find the diameter of a circle whose area is 254.34 square inches.

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14-12-2015

area=pi times radius^2
radius=1/2diameter
2radius=diameter
solver

254.34=pi times r^2
aprox pi to 3.14
256.34=3.14 times r^2
divide both sides by 3.14
81=r^2
square root both sides
9=r
subsitue
2r=d
2(9)=d
18=d
the diameter is 18 inches

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