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geometry · worked example

Solve 半徑 10 的圓 — A = 100π ≈ 314.16

Method: 圓面積公式. Verified step-by-step solution with our free AI math solver.
Problem

A=πr2, r=10A = \pi r^2,\ r = 10

Step-by-step solution

  1. 套用 A=πr2A = \pi r^2，其中 r=10r = 10。

  2. A=π⋅100=100π≈314.16A = \pi \cdot 100 = 100\pi \approx 314.16。

Answer

A=100π≈314.16A = 100\pi \approx 314.16

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