图一 |
半径=5÷2=2.5
表面积=3.14x2.5x2+3.14x5x8
=3.14x6.25x2+3.14x5x8
=39.25+125.6
=164.85
|
图二 |
表面积=3.14x4x2+3.14x2x4x6
=3.14x16x2+3.14x2x4x6
=100.48+150.72
=251.2
|
⑴ | 侧面积= 3.14x10x8=251.2 |
⑵ |
半径=10÷2=5
表面积=3.14x10x8+3.14x5x2
= 3.14x10x8+3.14x25x2
=251.2+157
=408.2
|