plz urgent
i will thank your all answers
Share
plz urgent
i will thank your all answers
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Answer:
3168cm^2
Step-by-step explanation:
Solution :
Length of the pipe, h = 20 cm
External radius of the pipe, R=252cm=12.5cm
Thickness of the pipe = 1cm
Internal radius of the pipe, r=(12.5−1)cm=11.5cm
Total surface area of the pipe
= (external curved surface area) +
(internal curved surface area) + 2(area of the base ring)
=[2πRh+2πrh+2(πR2−πr2)] sq units
[2πh(R+r)+2π(R2−r2)] sq units
=2π(R+r)[h+(R−r)] sq units
=2×227×(12.5+11.5)(20+12.5−11.5)cm2
=(2×227×24×21)cm2=3168cm2