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A metal pipe is 77 cm …

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A metal pipe is 77 cm long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4cm . Find it's inner curved surface area, outer curved surface area, total surface area

Posted by Aditya Gurjar 3 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Kanav Kanav 3 years, 8 months ago

First find only outer and inner csa of the cylinder then put down the formula 2pie r2-R2 +1064.8 and968cm2

Palakpreet Kaur 3 years, 8 months ago

Height of metal pipe =77cm Inner dia=4cm; radius =4/2 = 2cm Outer dia=4.4; radius=4.4/2=2.2cm A)inner c.s.a. =2Πrh 2×22/7×2×77 =44×2×11=968cm² B)outer c.s.a =2Πrh 2×22/7×2.2×77=1064.8cm² C)total surface area=inner c.s.a+outer c.s.a+area of 2 rings Area of 2 rings {R²-r²}=2Πr²=2×22/7×(2.2²-2²) 2×22/7×(4.84-4) =5.28cm² Icsa+ocsa+a of 2 rings 968+1064.8+5.28=2032.8+5.28=2038.08cm²

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