《2025年口算训练宁波出版社六年级数学上册人教版》

| 图形 | 已知条件 | 面积 |
| | $a= 2\ \text{cm}$ | $4\ \text{cm}^2$ |
| 正方形 | $a= 8\ \text{dm}$ | $64\ \text{dm}^2$ |
| | $a= 6\ \text{cm}\ \ b= 3\ \text{cm}$ | $18\ \text{cm}^2$ |
| 长方形 | $a= 5\ \text{m}\ \ b= 2.4\ \text{m}$ | $12\ \text{m}^2$ |
| | $a= 5\ \text{cm}\ \ h= 2\ \text{cm}$ | $10\ \text{cm}^2$ |
| 平行四边形 | $a= 7\ \text{dm}\ \ h= 3\ \text{dm}$ | $21\ \text{dm}^2$ |
| | $a= 4\ \text{cm}\ \ h= 3\ \text{cm}$ | $6\ \text{cm}^2$ |
| 三角形 | $a= 5\ \text{cm}\ \ h= 6\ \text{cm}$ | $15\ \text{cm}^2$ |
| | $a= 1\ \text{m}\ \ b= 3\ \text{m}\ \ h= 2\ \text{m}$ | $4\ \text{m}^2$ |
| 梯形 | $a= 2\ \text{cm}\ \ b= 5\ \text{cm}\ \ h= 4\ \text{cm}$ | $14\ \text{cm}^2$ |
| | $r= 2\ \text{cm}$ | $12.56\ \text{cm}^2$ |
| 圆 | $r= 0.1\ \text{m}$ | $0.0314\ \text{m}^2$ |
| | $d= 4\ \text{dm}$ | $12.56\ \text{dm}^2$ |
| | $d= 20\ \text{cm}$ | $314\ \text{cm}^2$ |

答案： | 图形 | 已知条件 | 面积 |
|------------|-------------------------|------|
| 正方形 | $a= 2\ \text{cm}$ | $4\ \text{cm}^2$ |
| | $a= 8\ \text{dm}$ | $64\ \text{dm}^2$ |
| 长方形 | $a= 6\ \text{cm}\ \ b= 3\ \text{cm}$ | $18\ \text{cm}^2$ |
| | $a= 5\ \text{m}\ \ b= 2.4\ \text{m}$ | $12\ \text{m}^2$ |
| 平行四边形 | $a= 5\ \text{cm}\ \ h= 2\ \text{cm}$ | $10\ \text{cm}^2$ |
| | $a= 7\ \text{dm}\ \ h= 3\ \text{dm}$ | $21\ \text{dm}^2$ |
| 三角形 | $a= 4\ \text{cm}\ \ h= 3\ \text{cm}$ | $6\ \text{cm}^2$ |
| | $a= 5\ \text{cm}\ \ h= 6\ \text{cm}$ | $15\ \text{cm}^2$ |
| 梯形 | $a= 1\ \text{m}\ \ b= 3\ \text{m}\ \ h= 2\ \text{m}$ | $4\ \text{m}^2$ |
| | $a= 2\ \text{cm}\ \ b= 5\ \text{cm}\ \ h= 4\ \text{cm}$ | $14\ \text{cm}^2$ |
| 圆 | $r= 2\ \text{cm}$ | $12.56\ \text{cm}^2$ |
| | $r= 0.1\ \text{m}$ | $0.0314\ \text{m}^2$ |
| | $d= 4\ \text{dm}$ | $12.56\ \text{dm}^2$ |
| | $d= 20\ \text{cm}$ | $314\ \text{cm}^2$ |