Question

In each example given below, radius of base of a cylinder and and its height are given. Then find the curved surface area and total surface area.
(1) r = 7 cm, h = 10 cm (2) r = 1.4 cm, h = 2.1 cm (3) r = 2.5 cm, h = 7 cm
(4) r = 70 cm, h = 1.4 cm (5) r = 4.2 cm, h = 14 cm

Answer 1

Here is the formula.Now put the value from questions.Here the value of π=3.14 or 22/7.

Answer 2

Answer:

Curved surface Area of cylinder = 2πRh

Total Area of cylinder = 2πRh + 2πR² = 2πR ( h + R)

Step-by-step explanation:

Curved surface Area of cylinder = 2πRh

Total Area of cylinder = 2πRh + 2πR² = 2πR ( h + R)

π = 22/7

1)  r = 7 cm, h = 10 cm

Curved surface Area of cylinder = 2 *  (22/7) * 7 * 10 = 440 cm²

Total Area of cylinder = 2(22/7)(7)(10 + 7) = 44*17 = 308 cm²

2)  r = 1.4 cm, h = 2.1 cm

Curved surface Area of cylinder = 2 *  (22/7) * 1.4 * 2.1 = 18.48 cm²

Total Area of cylinder = 2(22/7)(1.4)(2.1 + 1.4) = 44*17 = 30.8 cm²

(3) r = 2.5 cm, h = 7 cm

Curved surface Area of cylinder = 2 *  (22/7) * 2.5 * 7 = 110 cm²

Total Area of cylinder = 2(22/7)(2.5)(7 + 2.5) = 44*17 = 149.29 cm²