Question

The sides of right angled triangle are 3 cm and 4cm. If the triangle is revolved round the hypotenuse. The radius of the obtained double cone will be:

(A) 2.4 cm

(B) 2.8 cm

(C) 5 cm

(D) 6 cm

Answer 1

Answer is (A) 2.4 cm

Let in ∆ABC,

∠B = 90°, AB = 4 cm, BC = 3 cm