Find the perimeter and the area of the figure.
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Use A = (1/2)(a)(p)
Here a is the apothem and p is the perimeter.
Perimeter = side times length of side.
P = 8(10)
P = 80
To find the area, use the formula above.
A = (1/2)(a)(p)
A = (1/2)(12)(80)
A = 480
I hope this helps.