Question

A metal pipe is 77 cm long. The inner diameter of a cross
section is 4 cm, the outer diameter being 4.4 cm
(see Fig. 13.11). Find its
inner curved surface area,
(ii)outer curved surface area,
(iii) total surface area.​

Answer 1

Step-by-step explanation:

Inner curved surface area=inner circumference×h=(22÷7)×4×77=968cm^2

Outer curved surface area=circumference×h=

(22÷7)×4.4×77=1064.8cm^2

Total Surface area= 1064.8cm^2 + 2×22÷7×2.2^2

=1094.4cm^2 approximately