Question

the metal pipe 77 cm long the inner diameter of a cross section is 4 cm the outer diameter being 4 4 cm find its inner curved surface area outer curved surface area and total surface area

Answer 1

Answer:

We have, height =77cm

Inner diameter, d=4cm

SO, Inner radius, r!=2cm

outer diameter, D=4.4cm

SO, Outer radius, R=2.2cm

¹) inner curved surface area =2πrh

=2×22/7×2×77

=968cm²

²)Outer curved surface area =2πRh

=2×22/7×22/10×77

=1064.8cm²

³) Total surface area. =2πrh + 2πRh +2π(R²-r²) =968+1064.8+2×22/7(2.2²-2²)

=2032.8+44/7×4.2×0.2

=2032.8+5.28

=2038.08cm²

HOPE IT HELPS!!!

Step-by-step explanation:

PLEASE MARK IT AS BRAINLIEST