Question

the slant height of the frustum of a cone is 4cm and the upper radius and lower radius is 9and3cm find the surface area​

Answer 1

Answer:

Step-by-step explanation:

Slant height ,l= 4cm

Upper radius,r1 = 9cm

Lower radius ,r2 = 3cm

CSA =pi (r1+r2)×l

=22/7(9+3)4

=22/7 ×12×4

=150.85