Assertion: A cone is a solid figure. Reason: A cone is generated when rectangular sheet is rotated about its axis. Which of the following is correct?
Assertion is true. A cone is generated when a right angled triangle is rotated about its base. So, the reason is false.
A rectangular sheet of dimensions 25 cm×7 cm is rotated about its longer side. Find the volume and the whole surface area of the solid thus generated.