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Find the area of the shape, there are 6 sides

Find the area of the shape, there are 6 sides-example-1

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Answer:

Explanation:

all the three sides of a triangle are equal.

length of perpendicular from center on the side=
h=\sqrt{21^2-((21)/(2))^2} =(21)/(2)√(3) \\area ~of~shape=6 * (1)/(2) * 21 * (21)/(2)√(3) \\=(1321)/(2)√(3) ~sq. ~ft.

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