The circumference is 81 cm. Find the area of the circle.
| December 16, 2020 | education
Circumference formula: L = 2пR.
Formula for the area of a circle: S = пR ^ 2
Let’s first find R (radius):
R = L: 2п = 81 / (2 × 3.14) = ≈12.9cm
We substitute our radius in the formula for finding the area of a circle.
S = 3.14 × (12.9) ^ 2 = 522.5274cm ^ 2
If rounded up, then ≈ 522.5cm ^ 2
Answer: 522.5cm ^ 2
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