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High School Placement Test Prep

Category - SHSAT Practice Test Question

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The diameter of a circle is 10 cm. What is its area?

78.5 cm²
100 cm²
7.8 cm²
20 cm²

Explanation

Answer: A- If the diameter of a circle is 10 cm, its area is 78.5 cm². Since the formula for the area of a circle is 3.14 (?) r², you can start by dividing the diameter in half in order to get the radius. In this case, 10 ÷ 2 = 5. And 5² = 25, so 3.14 x 25 = 78.5 cm².

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