Calculate the area of a circle whose circumference is 12.56 cm.
| January 4, 2021 | education
Circumference formula:
С = 2Pr, where Р – number pi
From here we find r
r = C: 2P
r = 12.56: 2 * 3.14 = 2 (cm)
Area of a circle formula:
S = (Pr ^ 2): 2, where P is the number pi, r ^ 2 is the square of the radius
S = (3.14 * 2 * 2): 2 = 6.28cm square
Answer: S = 6.28 cm square
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