In a cylinder radius is doubled and height is halved curved surface area will be A halved B doubled ...

Question

In a cylinder radius is doubled and height is halved curved surface area will be A halved B doubled C same D four times

Accepted Answer

C same Explanation Let the radius of a cylinder r unit Let the height of a cylinder h unit According to question Radius is doubled 2r Height is halved h2 Then Curved surface area of a cylinder 2 r h And according to the above condition Curved surface area 2 2 r h2 2 r h This is same as the curved surface area of the cylinder with radius r and height h Hence option C is the correct answer

NCERT Exemplar Solutions Class 9 Mathematics Solutions for Surface Areas and Volumes - Exercise 13.1 in Chapter 13 - Surface Areas and Volumes