Question

A rectangular piece of paper 10 cm by 5cm is rotated about the longer side. The lateral surface area of

the solid so generated is ...........​

Answer 1

Step-by-step explanation:

a rectangular piece rotated to form cylinder so,

LSA of cylinder is 2¶rh

length of cylinder is 10cm

diameter of cylinder is 5(radius of cylinder is 5/2)

LSA=2x22/7x5/2x10

=157cm²