9.The radius of the base of a right circular cylinder is increased by

1.	9.The radius of the base of a right circular cylinder is increased by 75% and the height isdecreased by 50%. Find the per cent increase or decrease in the (i) volume, and (ii) curvedsurface area.
Answer» 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%

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

Answer»

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

)=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

)=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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9.The radius of the base of a right circular cylinder is increased by 75% and the height isdecreased by 50%. Find the per cent increase or decrease in the (i) volume, and (ii) curvedsurface area.​

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