the radius and height of cylinder are in ratio 7:2.if the volume of cylinder is 8316cm³ ,find total surface area of cylinder
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FORMULA FOR VOLUME OF CYLINDER = pi X r^2 X h
Let the height be 2x
Radius = 7x
Volume = pi X 49x^2 X 2x = 3.14 X 98x^3 = 8316
x^3 = 8316 / 3.14*98 = 27.024567 cm
x = 3 cm
HEIGHT = 6 cm Radius = 21 cm
FORMULA FOR TOTAL SURFACE AREA = 2pirh + 2pir^2
= 2pir ( r + h)
= 2 X 3.14 X 21 X 27 = 3560.76 cm^2 ANSWER
Let the height be 2x
Radius = 7x
Volume = pi X 49x^2 X 2x = 3.14 X 98x^3 = 8316
x^3 = 8316 / 3.14*98 = 27.024567 cm
x = 3 cm
HEIGHT = 6 cm Radius = 21 cm
FORMULA FOR TOTAL SURFACE AREA = 2pirh + 2pir^2
= 2pir ( r + h)
= 2 X 3.14 X 21 X 27 = 3560.76 cm^2 ANSWER
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2πrh
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