Question

find the C.S.A and T.S.A of each of the following right circular cones.(i)OP=2cm;Ob=3.5cm(ii)OP=3.5cm;AB=10cm​

Answer 1

Step-by-step explanation:

See this attachment..

Hope its help..

Answer 2

Solution:

Height of cone(h) = 21 cm

Slant height of cone (l) = 28 cm

We know that, l2 = r2 + h2

282=r2+212

r2=282−212

or r= 7√7 cm

Now,

Area of the circular base = πr2

= 22/7 x (7√7 )2

=1078

Therefore, area of the base is 1078 cm2