The area of a triangle is 54 cm}^2 and its base is 9 cm}.
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The area of a triangle is $54\text{ cm}^2$ and its base is $9\text{ cm}$. What is its height?
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Answer: A. 12 cm
Area = 0.5 * base * height => 54 = 0.5 * 9 * h => 4.5h = 54 => h = 12 cm.
Step-by-step Derivation:
Step 1: Area = (1/2) * b * h.
Step 2: 54 = (1/2) * 9 * h = 4.5 * h.
Step 3: h = 54 / 4.5 = 12 cm.