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area = base x height ÷ 2 ⇒ height = 2 x area ÷ base ⇒ height = 2 x 15 ÷ 3 = 10 inches.
Area=(1/2)(base times height). This is written as A=bh/2. The base is 39 inches and the height is 15 inches, so: A=(39x15)/2=585/2=292.5 square inches
Area = 1/2*(15+9)*7 = 84 square inches
225 sqin
180 sq in. ... that's (12 X 15)/2 equals 180.