Question

if the radius of a cylinder is increased from 4 cm to 16 cm and the surface area of it kept same. if its height is 4 cm what will be its new height.

Answer 1

Answer

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H =1 cm

Answer 2

Its new height is 1 cm

Step-by-step explanation:

Initial radius of cylinder = 4 cm

Height of cylinder = 4 cm

Surface area of cylinder =$2 \pi r h = 2 \times \frac{22}{7} \times 4 \times 4$

the radius of a cylinder is increased from 4 cm to 16 cm and the surface area of it kept same.

New radius = 16 cm

Height = h

So,$2 \times \frac{22}{7} \times 4 \times 4= 2 \times \frac{22}{7} \times 16 \times h$

$4 \times 4= 16 \times h$

$\frac{ 4\times 4}{16}=h$

Height = 1

Hence Its new height is 1 cm

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Radius of a cylinder is increased by 150 cm and height is decrease by 20 cm what is the % increase in its volume

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