Question

Determine of the base of a cone is 10.5 cm and its slant height is 10 cm.find its curved surface area

Answer 1

the answer is 165cm square

diameter 10.5  so radius is 5.25

assume pie value22/7

so 22/7*5.25*10

so final answer is 165 cm square

Answer 2

Note; you type determine I think it is diameter

d/2=r

10.5/2=5.25=r

slant height(l)=10

Curve surface area of cone =πrl

=22÷7×10×5.25

=22*10*0.75

=220*0.75

=165

Taking pi as 3.14

=3.14*10*5.25

=31.4*5.25

=164.85

Approx. 165