Question

The external diameter and internal radius of
an open pipe of length 0.5 m are
respectively 20 cm and 3 cm. Find the total
surface area of the pipe.
​

Answer 1

Step-by-step explanation:

GIVEN

the external diameter=20,cm

since radius R=10

INTERNAL radius. r. =3cm

HEIGHT OF PIPE=0.5M

=50CM

NOW ,

TSA=2π(R+r)(h+R-r)

TSA=2π(10+3)(50+10-3)

TSA,=2π*13*57

=2*π*13*57

=36*57*π

=2052π

=2052πcm²

since the TSA is 2052πcm^2

or 0.2052m²

hope this helps you