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