The area of circle is 172.1 cm², then circumference of circle is _____?
- 46.51 cm
- 45.6 cm
- 44.51 cm
- None of these
Explanation
Given the area A = 172.1 cm², and the formula for the area of a circle is A = πr²:
Step 1: Find the radius
172.1 = πr²
r² = 172.1 / π
r² = 172.1 / (22/7)
r² = 172.1 * (7/22)
r² = 54.77
r ≈ √54.77
r ≈ 7.4
Step 2: Calculate the circumference
Circumference C = 2πr
C = 2 * (22/7) * 7.4
C ≈ 2 * 3.14 * 7.4
C ≈ 46.51
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