Question

right angled triangle ABC with sides 3cm, 4cm,5cm is revolved about the fixed side of 4 cm find the value of the solid generated. also , find the total surface area of the solid​

Answer 1

Answer:

Answer✏:-

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Answer 2

Answer:

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

hope this helps you