Answer :

well u do 31.2 x 18 which is 561.6 then u divide by 2 because the formula for a triangle is base x height divided by 2 so It is 280.8
Area of triangle = base × height ÷ 2
18 × 31.2 ÷ 2 = 280.8
The area is 280.8 inches²

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