圆的面积与周长应用题测验

Question 1

一个圆形花园的半径为 $r=7\,	ext{m}$。它的面积是多少？（取 $\pi \approx 3.14$。）

Accepted Answer

$153.86\,	ext{m}^2$

Answer

$21.98\,	ext{m}^2$

Answer

$307.72\,	ext{m}^2$

Answer

$43.96\,	ext{m}^2$

Question 2

一个四分之一圆的半径为 $8\,	ext{cm}$。它的面积是多少？（取 $\pi \approx 3.14$。）

Accepted Answer

$50.24\,	ext{cm}^2$

Answer

$200.96\,	ext{cm}^2$

Answer

$25.12\,	ext{cm}^2$

Answer

$100.48\,	ext{cm}^2$

Question 3

一张长方形纸片大小为 $20\,	ext{cm}$ 乘 $14\,	ext{cm}$。从中剪去一个半径为 $7\,	ext{cm}$ 的圆。剩余面积是多少？（取 $\pi \approx 3.14$。）

Accepted Answer

$126.14\,	ext{cm}^2$

Answer

$230.74\,	ext{cm}^2$

Answer

$433.86\,	ext{cm}^2$

Answer

$182\,	ext{cm}^2$

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