Question

The lateral surface area of a cylinder is 1056 CM² and height is 10 cm find its radius

21/2cm
84/5cm
42/2cm
11.5​

Answer 1

lateral surface area of cylinder = 2πrh

so , 2 × 22/7 × r × 10 = 1056

440r/ 7 = 1056

r =( 1056 × 7 )440 = 84/5 cm or 16.8 cm

Answer 2

The answer is 16.8 ( corr. to 3 sig. fig ) so the closest answer should be 84/5cm