Dan V. | Licensed HS Math Teacher, 17 years experienceLicensed HS Math Teacher, 17 years exper...

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Use the formula for the area of a triangle: A = 0.5(b * h). Since the height = h, and the base = h + 6, make the appropriate substitution into the formula and simplify. HINT: you'll get a quadratic expression in h^{2}. Then evaluate the expression for h = 12 inches.