Diameter of cylinder A is 7 cm and the height is 14 cm. Diameter of cylinder B is 14 cm and height is 7 cm. Without doing any calculations can you suggest whose volume is greater? Verify it by finding the volume of both the cylinders. Check whether the cylinder with greater volume also has greater surface area.
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solution
Yes, we can say that volume of cylinder B is greater, since radius of cylinder B is greater than that of cylinder A.
Find Volume for cylinders A and B
Diameter of cylinder A = 7 cm
Radius of cylinder A = 7/2 cm
And Height of cylinder A = 14 cm
Volume of cylinder A = πr2h
= (22/7 )×(7/2)×(7/2)×14 = 539
Volume of cylinder A is 539 cm3
Now, Diameter of cylinder B = 14 cm
Radius of cylinder B = 14/2 = 7 cm
And Height of cylinder B = 7 cm
Volume of cylinder B = πr2h
= (22/7)×7×7×7 = 1078
Volume of cylinder B is 1078 cm3
Find surface area for cylinders A and B
Surface area of cylinder A = 2πr(r+h )
= 2 x 22/7 x 7/2 x (7/2 + 14) = 385
Surface area of cylinder A is385 cm2
Surface area of cylinder B = 2πr(r+h)
= 2×(22/7)×7(7+7) = 616
Surface area of cylinder B is 616 cm2
Yes, cylinder with greater volume also has greater surface area.
hope it helps you
Step-by-step explanation:
community to property of addition subtraction multiplication division in rational numbers
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