ISEE Mathematics Achievement Question 225: Answer and Explanation

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Question: 225

9. In the triangle shown, side a is 4 ft long and side b is 6 ft long. What is the area of the triangle?

A. 12 ft²
B. 18 ft²
C. 24 ft²
D. 36 ft²

Correct Answer: A

Explanation:

A is correct. To find the area of a triangle, use the formula A = (½)bh where b is the base of the triangle and h is the height. Because the triangle shown is a right triangle, side a is the height. Substituting into the formula: A = (½)(6)(4) = 12 ft².

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