《2025年口算训练六年级数学上册人教版双色升级版》

填表。
| |圆的周长|圆的面积|
|$r = 0.5cm$| | |
|$d = 2cm$| | |
|$r = 2m$| | |
|$d = 1dm$| | |
|$r = 3cm$| | |
|$d = 6m$| | |
|$r = 40mm$| | |
|$d = 4m$| | |
|$r = 10m$| | |
|$d = 100cm$| | |
|$d = 0.8m$| | |
|$r = 5cm$| | |
|$r = 6cm$| | |
|$d = 8dm$| | |
|$r = 1.5cm$| | |

答案： 解析：本题考查圆的周长和面积的计算。需要使用圆的周长公式 $C = 2\pi r$ 或 $C = \pi d$，以及圆的面积公式 $S = \pi r^{2}$。
答案：
| | 圆的周长 | 圆的面积 |
| --- | --- | --- |
| $r = 0.5\text{cm}$ | $3.14 × 2 × 0.5 = 3.14\text{cm}$ | $3.14 × 0.5^{2} = 0.785\text{cm}^{2}$ |
| $d = 2\text{cm}$ | $3.14 × 2 = 6.28\text{cm}$ | $3.14 × 1^{2} = 3.14\text{cm}^{2}$ |
| $r = 2\text{m}$ | $3.14 × 2 × 2 = 12.56\text{m}$ | $3.14 × 2^{2} = 12.56\text{m}^{2}$ |
| $d = 1\text{dm}$ | $3.14 × 1 = 3.14\text{dm}$ | $3.14 × (0.5)^{2} = 0.785\text{dm}^{2}$ |
| $r = 3\text{cm}$ | $3.14 × 2 × 3 = 18.84\text{cm}$ | $3.14 × 3^{2} = 28.26\text{cm}^{2}$ |
| $d = 6\text{m}$ | $3.14 × 6 = 18.84\text{m}$ | $3.14 × 3^{2} = 28.26\text{m}^{2}$ |
| $r = 40\text{mm}$ | $3.14 × 2 × 40 = 251.2\text{mm}$ | $3.14 × 40^{2} = 5024\text{mm}^{2}$ |
| $d = 4\text{m}$ | $3.14 × 4 = 12.56\text{m}$ | $3.14 × 2^{2} = 12.56\text{m}^{2}$ |
| $r = 10\text{m}$ | $3.14 × 2 × 10 = 62.8\text{m}$ | $3.14 × 10^{2} = 314\text{m}^{2}$ |
| $d = 100\text{cm}$ | $3.14 × 100 = 314\text{cm}$ | $3.14 × 50^{2} = 7850\text{cm}^{2}$ |
| $d = 0.8\text{m}$ | $3.14 × 0.8 = 2.512\text{m}$ | $3.14 × 0.4^{2} = 0.5024\text{m}^{2}$ |
| $r = 5\text{cm}$ | $3.14 × 2 × 5 = 31.4\text{cm}$ | $3.14 × 5^{2} = 78.5\text{cm}^{2}$ |
| $r = 6\text{cm}$ | $3.14 × 2 × 6 = 37.68\text{cm}$ | $3.14 × 6^{2} = 113.04\text{cm}^{2}$ |
| $d = 8\text{dm}$ | $3.14 × 8 = 25.12\text{dm}$ | $3.14 × 4^{2} = 50.24\text{dm}^{2}$ |
| $r = 1.5\text{cm}$ | $3.14 × 2 × 1.5 = 9.42\text{cm}$ | $3.14 × 1.5^{2} = 7.065\text{cm}^{2}$ |