Question

A toy is in the form of a cone of radius 3.5 cm mounted on a hrmisphere of same radius .The total height of the toy is 15.5 cm. find the total surface area of the toy​

Answer 1

Answer:

Total surface area of toy =  Curved surface area of cone +  surface area of hemisphere

Curved  surface area of cone = πrl

Where r=3.5cm, Height =15.5−3.5=12cm

And hence, l=12.5cm       (by using formula l2=h2+b2)

Therefore C.S.A. of cone =π×3.5×12.5

=137.5cm2

Surface area of hemisphere =2πr2

=2×π×(3.5)2

=77cm2

Hence T.S.A of toy =77+137.5=214.5cm2

Answer 2

Step-by-step explanation:

ANSWER

Total surface area of toy = Curved surface area of cone + surface area of hemisphere

Curved surface area of cone = πrl

Where r=3.5cm, Height =15.5−3.5=12cm

And hence, l=12.5cm (by using formula l

2

=h

2

+b

2

)

Therefore C.S.A. of cone =π×3.5×12.5

=137.5cm

2

Surface area of hemisphere =2πr

2

=2×π×(3.5)

2

=77cm

2

Hence T.S.A of toy =77+137.5=214.5cm

2