Area of the base = 10 x 10 = 100 u^2
Length of the height =
c^2 = 12^2 + 5^2
= 144 + 25
= 169
c = 13 m
Area of a side = 10 x 13/2
= 130/2
= 65 m^2
Number of sides = 4
Area of the 4 sides = 4 x 65
= 260 m^2
Surface area = 260 + 65
= 325 m^2
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