The bottom is 12.56cm, the height is 8cm triangle area ..

Area = 12.56 × 8 × 1 / 2 = 50.24 square centimeter

The bottom radius of the cylinder is 4cm. How many square centimeters can the height of the cylinder be reduced by 10cm?

S minus = 2 π RH = 2 π × 4 × 10 = 80 π≈ 251.2 (square centimeter)

There is a cylinder with a height of 10 cm. If its height is reduced by 2 cm, its surface area will be reduced by 18.84 square cm?

Bottom perimeter: 18.84 △ 2 = 9.42 (CM)
Bottom radius: 9.42 △ 3.14 △ 2 = 1.5 (CM)
Bottom area: 3.14 × 1.5 ^ 2 = 7.065 (cm2)
Cylinder volume: 7.065 × 10 = 70.65 (cm3)

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