Lateral area of cylinder = circumference of bottom circle × surface area of high cylinder = upper and lower bottom areas+lateral area.
3. There is no cover, that is, there is only the bottom, that is, surface area = bottom area+lateral area = 3. 14 * (8/2) square +3. 14 * 8 * 8 = 25 1.2 (square decimeter).
4. Surface area = bottom area+lateral area = 3.14 * (25.12/3.14/2) squared+25.12 *10 = 30/kloc.
5. Side area = bottom perimeter * height = 3. 14 * 2.2 = 12.56 square decimeter.
Surface area = bottom area+lateral area = 2 * 3.14 * 2 * 2+15.26 * 2.5 =
6. Side area = perimeter * height = 3. 14 * 60 * 50 =
Surface area = 2 * 3. 14 * (60/2) square+side area =
7. lateral area = 18.84 * 2 = surface area = 2 * 3.14 * (18.84/31.4/2) square+lateral area =
8. The gasoline tank has a cover and a bottom: surface area = [2.3. 14 * (60/2) square +3. 14*60*80]* 10=
9. Transverse area = (3.14 *1*1.5) *100 =
10. Increased surface area = [2 * 3. 14 * (8/2) square+3.14 * 8 * (16+10)]-[2 * 3]
1 1. Surface area = 2.3.14 * 36+3.14 *16 *10 =
12. Only one bottom, surface area = 3.14 * 4/2 * 3.14 * 4 *1.5 =
13. Side area = perimeter * height 25.12 = 3.14 *10 * height = 25. 12/3 1.40 = 0.8.
14. The interface is 2CM, that is, 30+2 = 323.2m = 32dm.
Surface area = 3. 14 * (32/2) square +3. 14 * 32 * 32 =
For reference only, work out the answer by yourself. Just memorize the surface area of the circle and lateral area's formula. Don't be too lazy to learn. You'd better do it yourself.