Question

Two cones with same base radius 3 cm and height 4 cm are joined together
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along their bases. The surface area of the shape so formed is (Use Te = 3.14)
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Answer 1

Answer:

surface area of shape so formed = pie rl + pie rl

l= root 3^2+4^2

=root 9+16

= root 25

=5

=3.14×3×5+3.14×3×5

=15.90+15.90

=31.80

or 31.8 cm^2

Answer 2

Answer:

150.72

Step-by-step explanation:

Tsa of a cone formula is pi r (l + r)

h=4

Pi=3.14

r=3

l2 = h2 + r2

=4x4 + 3x3

l2 = 16 + 9

l=sq root of 25

l=5

Using the formula

We have to add two cones to find the total surface area of the whole shape formed

2x 3.14 x 3 x (5+3)

=150.7cm2 is the tsa of the whole shape formed