Question

A toy is in the shape of hemisphere...a small hemisphere is mounted on bigger hemisphere..radius of small is 1 cm and bigger is 2cm find total surafce area

Answer 1

the correct answer is 40.82 cm²

explanation: as shown in the figure the red part
will not be counted.

therefore, the total surface of toy
=t.s.a(bigger hemisphere)+c.s.a(smaller hemisphere)- a(base of smaller hemisphere)
=3πr²+2πr²-πr²

=3×3.14×4+2×3.14×1-3.14×1

=37.68+6.28-3.14

=43.96-3.14

=40.82cm²