What is the radius of a circle whose area is numerically equal to its circumference?
Answer and explanation
Correct answer: C. 2 units
- Step 1: Set up the algebraic equality: .
- Step 2: Divide both sides by (since ): .
Answer
2 units.
Why not the others: '1 unit' makes area and perimeter ; '4 units' makes area and perimeter ; '8 units' makes area and perimeter .
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