Question

Q1.The radius and height of a cylinder are in the ratio 5:7 and its surface area is 18480 square cm. Then its radius is ____________.​

Answer 1

Let the radius = r height = h

Given,

5r = 7h

h = 5r/7

Curved Surface Area = 2πrh

18480 = 2 × 22/7 × r × 5r/7

220r²/ 49 = 18480

220 r² = 905520

r² = 4116

r = 65.15 cm

Answer 2

Step-by-step explanation:

It's the correct answer... 35 cm