Question

A metal pipe is 77cm long the inner diameter of a cross section is 4cm,the outer diameter being 4.4 cm find its
a) inner curved surface area
b) outer curved surface area
c) total surface area
​

Answer 1

Answer:

968 + 1064.8 + 5.28

Step-by-step explanation:

-- INNER CURVED SURFACE AREA --

Given Length of metal pipe = 77 cm

Inner Diameter of metal pipe = 4 cm

Inner radius of pipe (r) = 4÷2 = 2 cm

Inner Curved Surface area = 2πrh

=>

-- OUTER CURVED SURFACE AREA --

Outer diameter of pipe = 4.4 cm

Outer Radius of pipe (R) = 4.4 ÷ 2 = 2.2 cm

Outer Curved suface area = 2πRh

=>

-- TOTAL SURFACE AREA --

There are 2 circles of radii 2cm and 2.2 cm at both the ends of pipe.

Therefore Area of 2 edges of pipe

=> 2(area of outer Circle - area of inner circle)

=>

Total Surface area of pipe =

Inner curved surface area + outer curved surface area + Area of two edges

=> 968 + 1064.8 + 5.28

or refer to link.

HOPE IT WOULD HELP YOU