Question

The radius of the base of a right circular cylinder is increased by 75% and the height is decreased by 50%. Find the per cent increase or decrease in the (i) volume, and (ii) curved surface area.​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

The radius of the rate of the right circular cylinder is increased by 75% and height is decreased by 50% Find the percentage increase or deceases inits curved surface area

Curved surface area of cylinder (S

1

)=2πrh

radius is increased by 75%

So,new radius =1.75r

height is decreased by 50% so the

new heights 0.5h

Curved surface area (S

2

)=2π(1.75)r(0.5h)

=1.75πrh

Curved surface area decreases by =(

2πrh

2πrh−1.75πrh

×100)%

=(

2πrh

0.25πrh

×100)%

=12.5%

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