to find the total surface area of a cylinder I would have to do this right.
Area of rectangle= 2 (pie r h) right?
2007-09-30 10:51:43 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
The area of a cylinder consists of the area of the two ends (2*pi*r*r) plus the area of the side, which is a curved rectangle. The height of the cylinder is one dimension, and 2*pi*r would be the other, so the area of the side would be (2*pi*r*h). You would add these two expressions together, but you can see that there is a common factor of 2*pi*r, so the final formula would be A = 2*pi*r(r+h).
2007-09-30 10:59:34 · answer #1 · answered by TitoBob 7 · 0⤊ 0⤋
Cylinder has three surfaces, one top end, bottom end and side.
For total surface area, you have to find out the area of each surface and add.
The area of top and bottom ends (circular shape)
= ¶ r^2 +¶ r^2
=> 2¶ r^2
the area of side = circumference* height
= 2 ¶ r h
so total surface area = 2 ¶ r^2 + 2¶ r h
= 2 ¶ r[r + h]
2007-09-30 11:08:38 · answer #2 · answered by mohanrao d 7 · 0⤊ 0⤋
total surface area of a cyclinder = 2x(area of the circle base)+area of the outside surface
= 2( (r^2) pi )+( 2r . pi . h )
= 2rpi(r+h)
SJSUmathlete
2007-09-30 11:01:44 · answer #3 · answered by Finnergan Ho 2 · 0⤊ 0⤋
yep that would work 2pi*radius would be a circle and time h would imply your cylinder circumference h times
2007-09-30 10:55:47 · answer #4 · answered by Anonymous · 0⤊ 1⤋
yaaaa its right.
2007-09-30 10:57:50 · answer #5 · answered by *~$w33ty~* 3 · 0⤊ 1⤋