Question

A cone of slant height 5cm and height 4cm find the curved surface area

Answer 1

CSA (cone)=
$\pi \times r \times l$
CSA=22/7 (r)5
r=
$\sqrt{ {l}^{2} - {h}^{2} }$
r=3
CSA=22/7×3×5
CSA=47.1sq.cm

Answer 2

here h=5cm

l=4cm

therefore,

lsquare=rsquare+rsquare

5 square=r square +4 square

25=r square+ 16

25-16=r square

9=rsquare

r=root 9

r=3

radius=3cm

csa=pie r(r+l)

=22/7*3(3+4)

=22/7*3*7

22*3

=66

therefore,csa=66cm squa