A times A or A^2
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area = length x width area = 90 feet 10 feet x 9 feet = 90 square feet.
AREA = LENGTH x WIDTH LENGTH = 2 X WIDTH AREA = 2 x WIDTH X WIDTH = 900 900/2 = WIDTH X WIDTH 450 = WIDTH X WIDTH = WIDTH SQUARED WIDTH = SQUARE ROOT (450) = 21.21 FEET LENGTH = 42.42 FEET
15 feet
Area of a Square = Length*Length = 3*3 = 9 square feet.
49 square feet