Question

A metallic pipe is 0.7cm thick.inner radius of the pipe is 3.5cm and length is 5dm .find its total surface area

Answer 1

Hey. !!

Here is your answer ==>

Thickness of the pipe =>0.7cm

inner radius of the pipe(r)=>3.5cm

External radius of the pipe(R)=>(3.5+0.7)cm or,4.2cm

length =>5dm or,50 cm

we know,

total surface area of pipe =>2π(r+R)(h+R-r)

or,

total surface area of pipe =>2×22/7(3.5+4.2)(50+4.2-3.5)

=>44/7× 7.7× 50.7

=>2453.88 cm² answer...

Hope it's help you !!

Answer 2

TSA of a hollow cylinder is=2pi (R+r)(R-r+h)
r=3.5cm
w=R-r
R=w+r
=0.7+3.5=4.2cm
=2×3.14(4.2+3.5)(4.2-3.5+50)=2451.6492cm^2