Question

a metal pipe is 77 cm long the lines dimension of the cross section is 4 cm and Outer is 4.4 find the inner curved surface area, the outer curved surface area,
and the total surface area​

Answer 1

Answer:

2038.08cm^2

Step-by-step explanation:

$h = 77cm \\ r 1= 2cm \\ r2 = 2.2cm \\ inner \: csa \: = 2\pi \: r1h \\ = \frac{2 \times 22 \times 2 \times 77}{7} \\ = 44 \times 22 \\ = 968 {cm}^{2} \\ outer \: csa = 2\pi \: r2h \\ = \frac{2 \times 22 \times 2.2 \times 77}{7} \\ = 44 \times 24.2 \\ = 1064.8 {cm}^{2} \\ tsa = inner \: csa + outer \: csa + 2 \times \pi( {r2}^{2} - {r1}^{2} ) \\ = 968 + 1064.8 + 5.28 \\ = 2038.08 {cm}^{2}$