a play-top is in the form of a hemisphere surmounted on a cone the diameter of the hemisphere is 3.6cm.the total height of the play top is 4.2 cm.find it's total surface area.
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given
diameter of =3.6 cm
total height = 4.2 cm
to find
t.s.a
solution
- t.s.a =c.s.a of hemisphere +c.s.a of cone
c.s.a of hemisphere=2π r*r
radius =36/20 =2*22/7*36/20*36/20=20.36sq.cm
c.s.a of cone =πrl
l=8.17
=22/7*36/20*8.17=46.21sq.cm
substituting the values in 1.
20.36+46.21=66.57sq.cm (approx)
ans.=66.57sq.cm
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