Question

If the radius of a right circular cylinder, open at both the
ends, is decreased by 25% and the height of the cylinder is
increased by 25% then the surface area of the cylinder, thus
formed
(1) Remains unaltered (2) Is increased by 25%
(3) Is decreased by 25% (4) Is decreased by 6.25%​

Answer 1

Answer:

is decreased by 25%

Step-by-step explanation:

Area of circular cylinder =  2 * pi * r * (r+h)

is we decreased r by 25%

and increase h by 25%

then area will decreased 25% because of r (square) .