Question

A metal pipe is 98 cm long. The inner diameter of the cross-section is 6 cm and outer
diameter is 6.6 cm. Find:
(a) Its inner curved surface area
(b) Outer curved surface area
(c) Total surface area
193​

Answer 1

Answer:

(a) Inner surface area=2πrh

=>2×22/7×3×98

=>44×3×14

=>44×42

=>1848cm2

(b)Outer=2πRh

=>2×22/7×3.3×98

=>2032.8cm2

(c) Total surface area = inner +outer +2[π(R2-r2)]

=>1848+2032.8+2×[22/7×(3.3)2-(3)2]

=>3937.12cm2

Answer 2

Answer:

(a) Inner CSA : 1848 cm²

(b) Outer CSA : 2032.8 cm²

(c) Total Surface Area : 3892.68 cm²