Question

find the curved surface area and total surface area of a cone having base radius 35cm and height 84cm

Answer 1

find slant height

=√(r) ^+(h) ^

= √(35)^+(84)^

=√1225+7056

=√8281

=91

the slant height =91cm

c.s.a of cone

=pie r L

= 22/7×35×91

=22/7×3185

=20.68

t.s.a of cone

= pie r(l+r)

=22/7 * 35(91+35)

=22/7*35( 116)

=22/7*4060

=120.76