3. Rectangle RECT is rotated 360° about the y-axis. Find the surface area and volume of the resulting solid of revolution. Be sure to do the following: Indicate the type of solid that was formed and its key dimensions. State all formulas. Show all substitutions and work. Use appropriate units in your answers. Answer:

Question

3. Rectangle RECT is rotated 360° about the y-axis.  Find the surface area and volume of the resulting solid of revolution. Be sure to do the following: Indicate the type of solid that was formed and its key dimensions. State all formulas. Show all substitutions and work. Use appropriate units in your answers. Answer:

kc_kennylau · Answer

A cylinder will be formed

kc_kennylau · Answer

Volume = pi*r*r*h

kc_kennylau · Answer

Surface area = 2*pi*r*(r+h)

anonymous · Answer

http://tinypic.com/view.php?pic=rm2n1l&s=8 Here's the link. Thank you so much!

anonymous · Answer

I don't know the key dimensions though.

kc_kennylau · Answer

wait... it ain't touching the axis...

kc_kennylau · Answer

Then big cylinder - small cylinder will be the volume

kc_kennylau · Answer

The key dimensions are the radii and the height

anonymous · Answer

Yeah but I don't know what they are since it gives me only points

kc_kennylau · Answer

The big radius is 6, the small radius is 3

kc_kennylau · Answer

Rotate the rectangle in your head

anonymous · Answer

How is there a big and a small radius?

kc_kennylau · Answer

|dw:1395115648045:dw|

anonymous · Answer

Im still kind of confused on this.

kc_kennylau · Answer

|dw:1395115807465:dw|