Radius of base of a cylinder is 20 cm and its height is 13 cm, find it

1.	Radius of base of a cylinder is 20 cm and its height is 13 cm, find its curved surface area and total surface area, (π = 3.14)
Answer» Given: Radius (r) = 20 cm, height (h) = 13 cm To find: Curved surface area and the total surface area of the cylinder Solution: i. Curved surface area of cylinder = 2πrh = 2 x 3.14 x 20 x 13 = 1632.8 sq.cm ii. Total surface area of cylinder = 2πr(r + h) = 2 x 3.14 x 20(20 + 13) = 2 x 3.14 x 20 x 33 = 4144.8 sq.cm ∴ The curved surface area and the total surface area of the cylinder are 1632.8 sq.cm and 4144.8 sq.cm respectively.

Radius of base of a cylinder is 20 cm and its height is 13 cm, find its curved surface area and total surface area, (π = 3.14)

Answer»

Given: Radius (r) = 20 cm, height (h) = 13 cm

To find: Curved surface area and the total surface area of the cylinder

Solution:

i. Curved surface area of cylinder = 2πrh

= 2 x 3.14 x 20 x 13

= 1632.8 sq.cm

ii. Total surface area of cylinder = 2πr(r + h)

= 2 x 3.14 x 20(20 + 13)

= 2 x 3.14 x 20 x 33 = 4144.8 sq.cm

∴ The curved surface area and the total surface area of the cylinder are 1632.8 sq.cm and 4144.8 sq.cm respectively.