A right angled ∆ABC with sides 3m ,4m and 5m is revolved about the fixed side 4 m. The volume of the solid generated is op
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A right angled ∆ABC with sides 3m ,4m and 5m is revolved about the fixed side 4 m. The volume of the solid generated is op
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Step-by-step explanation:
When rt. ∠ed △ABC is revolved about AB = 4 cm, it forms a right circular cone of radius 3 cm and height 4 cm . Slant height of the cone is 5 cm.
Volume of cone = 1 / 3 πr2h
1 / 3 × 22 / 7 × 3 × 3 × 4
= 37.71 cm3
Total surface area of the solid = πr2 + πrl = πr (r + l )
= 22 / 7 × 3 × 8 = 75.43 cm2