The tree has a girth of 19.8 dm. What is the cross-sectional area of a circular tree?
| March 3, 2021 | education
Applying the formula for finding the circumference l = 2πR, we find the radius of the circle:
2πR = 19.8;
R = 19.8 / (2π).
By the formula S = πR ^ 2, we find the area of the circle.
S = π (19.8 / (2π)) ^ 2 = (π * 392.04) / (4π ^ 2) = 98.01 / π = 31.21 (dm2).
Answer: S = 31.21 (dm2).
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