Find the total surface area of a right circular cylinder that has a radius of r = 7 inches and a height of h = 14 inches.
Express your answer in terms of without units. Please enter "pi" to write the symbol .
2006-11-02 06:11:47 · 6 answers · asked by Me 6 in Science & Mathematics ➔ Mathematics
use the formula
A=2pir(h+r)
=2pi*7*21
=294pi
2006-11-02 06:26:47 · answer #1 · answered by math 2 · 2⤊ 0⤋
Top has an area of:
A = pi * r² = 49 pi
Bottom is the same:
49 pi
The side is the circumference times the height:
C = 2 pi r = 14 pi
= 14 pi * 14 = 196 pi
So you have:
( 49 + 49 + 196 ) pi
294 pi
2006-11-02 14:24:21 · answer #2 · answered by Puzzling 7 · 2⤊ 0⤋
The area of the circle:
A=pi r^2
A=49 pi.
The circumference of the circle:
C=2pir
C=14*14 pi=196 pi.
Total area:
49+49+196 pi.=294 pi.
2006-11-02 16:38:48 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The two ends would be pi times the radius squared (each). So you would double that. Then 2 times pi times the radius would be the circumference. Multiply that times the height and add it all together.
My answer: 923.628240156 square inches
(sorry, I can't express without the units)
2006-11-02 14:23:51 · answer #4 · answered by Anonymous · 0⤊ 2⤋
surface area of a cylinder = 2 (pi) r h
(pi) approx = 3.14
r = 7
h = 14
2 (3.14) (7) (14) = 615.44 units
2006-11-02 14:26:27 · answer #5 · answered by kendogg102 2 · 0⤊ 2⤋
nevermind forget my answer I screwed up
2006-11-02 14:25:46 · answer #6 · answered by Roman Soldier 5 · 1⤊ 1⤋