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Answer:
The correct answer to this is 18 in²
Explanation:
Formula of the area of triangles: ½ × b × h = A
In this case it is: ½ × 4 in × 9 in = A = 36 × ½ = 18 in²
18 in^2.
Area of a triangle = 1/2 * base * height
= 1/2 * 4 * 9
= 1/2 * 36
= 18 in^2.