Question

From the top of a cone of base diameter 10 cm and height 12 cm, a small cone is cut off by slicing parallel to the base, 3 cm from the vertex. Total surface area of the frustum so obtained is

Answer 1

Answer:

Diameter of the cone ABO=10cm

∴ radius r1=210=5cm

Height of the cone ABO=h1=10cm

Height of the cone A∣B∣O=h2=4cm

First, let us find the other required data.

Radius of cone A∣B∣O=r2

Let the Slant height of cones ABO and A∣B∣O, be  l1 and l2 respectively.

∴r2r1=h2h1,r25=410

∴r2

PLEASE MARK ME AS THE BRIANLIEST