Find the area (in cm2) and the diameter (in cm), respectively, of a circle whose circumference is 40 cm?
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Correct answer: A
Explanation
The correct answer is option 1 i.e. 400π and 40.
Let the radius of the circle be 'R'
Circumference (2πR) = 40π
⇒ R = 20
Diameter of the circle = 2R = 40cm
Area ofthe circle = π R² = π × (20 × 20)
⇒ 400π