18. The adjoining figure shows a metal pipe 77 cm longThe inner diameter of cross section is 4 cm and theouter one is 4.4 cm.Find its(i) inner curved surface area(ii) outer curved surface area(ii) total surface area.

18. The adjoining figure shows a metal pipe 77 cm longThe inner diamet

1.	18. The adjoining figure shows a metal pipe 77 cm longThe inner diameter of cross section is 4 cm and theouter one is 4.4 cm.Find its(i) inner curved surface area(ii) outer curved surface area(ii) total surface area.
Answer» Givenheight=77cminner radius=4/2=2cmouter radius=4.4/2=2.2cmTo find..I) inner curved surface area..C.S.A = 2πrh2×22/7×2×77968cm²ii)outer curved surface area..C.S.A = 2πrh2×22/7×22/10×771064.8cm²iii) total surface area...2πrh+2πRh+2π(r²-R²)968+1064.8+2×22/7(2²-2.2²)2032.8+2×22/7×2/10×42/102032.8+5.282038.08cm²...