Question

A metl pipe is 77 cm long. The inner diameter of a cross section is 4 cm the outer diameter is 4.8 cm. Find its inner curved surface area

Answer 1

length =77 cm

inner diameter=4cm r=4cm÷2

r=2cm

inner surface area

=2πrh

=2 × 22/7 × 2 × 77

=2×2×22×11

=88×11

=968 cm^2