2006-12-22 10:26:34 · 7 answers · asked by friedyams 1 in Science & Mathematics ➔ Mathematics
Are you looking for outer surface area or inner volume? I assume you want surface area, so it is circumference times height. The formula for that is 2 times Pi times radius times height. 2*PI*5"*(8'*12")= 3015.928947 sq. in. Notice the 8 feet was multiplied by 12 inches to change it to inches. If you wanted the volume, the formula is Pi time radius squared times height. PI times 5"squared times (8' times 12") = 7539.822369 cubic in. Does that make sense?
2006-12-22 10:50:48 · answer #1 · answered by Deano 7 · 0⤊ 0⤋
Volume of a cylinder is (pi * r * r) * h
The diameter of your pipe is 10", so the radius is 5". The length is 8' * 12" which is 96" long.
So, volume of pipe in square inches is (3.141 * 5 * 5) *10
785.25 square inches, assuming the pipe is perfectly round.
2006-12-22 12:14:58 · answer #2 · answered by hardhouse_boy 2 · 0⤊ 1⤋
The measurement of solid would be in cubic inches. So are you looking for surface area? That would be
2*pi*r^2+2*pi*r*h
= 2*pi*5^2+2*pi*5*8*12
= 50*pi+960*pi
= 1010*pi
= 3173.008 square inches
2006-12-22 10:49:39 · answer #3 · answered by Anonymous · 0⤊ 1⤋
If you want to find the total outside surface area, then the answer is
Area = π[(10)(8)(12) + 2(10/2)^2] = 1010 π in^2
2006-12-22 10:36:37 · answer #4 · answered by sahsjing 7 · 0⤊ 0⤋
3015.84 sq. inches on the surface of your pipe.
The formula for this is the circumference X length
Your circumference is 10" X pi, or 31.415926 inches
Multiply by 96" (8 feet) and you get 3015.928896 square inches.
2006-12-22 10:37:53 · answer #5 · answered by Anonymous · 0⤊ 0⤋
A = 10π*8*12 = 3,015.9 in^2
2006-12-22 11:12:32 · answer #6 · answered by Helmut 7 · 0⤊ 0⤋
Pi r2 times length, same as any cylinder.
2006-12-22 10:28:50 · answer #7 · answered by Anonymous · 0⤊ 0⤋