The area of a triangle is calculated by the formula S = 1/2 * a * h, where S is the area of the triangle, a is the base, h is the height. From the condition of the problem, the base length and the length of the height of the triangle are known. Find what is the area of the triangle.
1/2 * 9 * 4 = 18 cm ^ 2.
Answer: The area of a triangle is 18 square centimeters.
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