Using pi = 22/7, what is the area of a circle with radius 7 cm?
Answer and explanation
Correct answer: C. 154 square cm, from (22/7) x 7 x 7 with the radius squared
- Step 1: Area = pi x r squared = (22/7) x 49. Step 2. (22/7) x 49 = 22 x 7 = 154. Answer: 154 square cm. Why not the others: 44 is 2 x pi x r; 308 doubles the answer; 77 halves it.
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