1. c = 12.56 cm high = 8 cm.
2.d= 10cm h=6cm
3.r=6dm h= 10dm
solve
1, c = 12.56 cm high = 8 cm.
Transverse area = ch =12.56× 8 =100.49 (square centimeter)
Bottom area = (12.56÷π) ÷ 2× (12.56÷π) ÷ 2×π.
=6.28÷π×6.28
=39.4384÷π
= 12.56 (cm2)
Surface area = side area+bottom area ×2
= 100.49+ 12.56×2
= 125 438+0 (square centimeter)
2、d= 10cm h=6cm
Transverse area =πdh
=3. 14× 10×6
= 188.4 (square centimeter)
Bottom area = 3.14×10 ÷ 2×10 ÷ 2.
=3. 14×25
=78.5 (square centimeter)
Surface area = side area+bottom area ×2
= 188.4+78.5×2
=345.4 square centimeters
3、r=6dm h= 10dm
Transverse area =2πrh
=2×3. 14×6× 10
=376.8 square centimeters
Bottom area =πrr
=3. 14×6×6
= 1 13.04 (square centimeter)
Surface area = side area+bottom area ×2
=376.8+ 1 13.04×2
=602.88 square centimeters