the slant height of the frustum of a cone is 4cm and the upper radius and lower radius is 9and3cm find the surface area
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Answer:
Step-by-step explanation:
Slant height ,l= 4cm
Upper radius,r1 = 9cm
Lower radius ,r2 = 3cm
CSA =pi (r1+r2)×l
=22/7(9+3)4
=22/7 ×12×4
=150.85
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