The internal radius of pipe is on and its external radius is 6.5 If the length of pipe es 21cm find the total surface area of pipe.
Answers
Answer:
428.61
Step-by-step explanation:
area of pipe = length*diameter*3.14
21×6.5×3.14 = 428.61
Answer:
Step-by-step explanation:
External diameter = 25 cm
External radius R = \frac{25}{2}=12.5 cm
2
25
=12.5cm
Thickness of pipe = 1 cm
Internal radius r = 12.5 cm - 1 cm = 11.5 cm
Length opf pipe = h = 20 cm
Total surface area of pipe = Outer surface area - inner surface area
Total surface area of pipe = 2 \pi R h +\pi R^2 - (2 \pi r h +\pi r^2)2πRh+πR
2
−(2πrh+πr
2
)
Total surface area of pipe = 2 \times \frac{22}{7} (12.5) (20) +\frac{22}{7}(12.5)^2 - (2 \times \frac{22}{7} (11.5) (20) +\frac{22}{7}(11.5)^2)=201.142 cm^22×
7
22
(12.5)(20)+
7
22
(12.5)
2
−(2×
7
22
(11.5)(20)+
7
22
(11.5)
2
)=201.142cm
2
Hence Total surface area of the pipe is 201.142 sq.cm.