7 The volume of a 1-metre iron rod is 1386 cu. cm. Find its diameter.
8 A rectangular piece of paper, 44 cm long and 16 cm broad, is rolled along its length to form a cylinder.
What is the radius of the cylinder? What is its volume?
9 A tank is in the form of a right circular cylinder. Its height is 48 m and the base area is 616 sq. m. Find
the lateral surface area and volume of the cylinder.