find 1) the slant height , 2) the curved surface area and 3) total surface area of a cone , if it's base radius is 8cm and height is 15cm
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Answer:
1. l=√r^2+h^2
l=√8^2+15^2
l=√64+225
l=√289
l=17
2). C.S.A of cone = πrl
=22/7×8×17
=2992/7
=427.4 cm^2
3). T.S.A of cone = πr(r+l)
= 22/7×8(8+17)
= 176\7×25
=4400/7
=628.57cm^2
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