Then students used play-doh to make a 3-D model of the solid with a given cross section of either equilateral triangles or squares.
Check out the video links below for more examples on volumes of solids formed by
revolving a region about a vertical line.
http://www.youtube.com/watch?v=fNhLphUjXus
http://www.khanacademy.org/math/calculus/solid_revolution_topic/disc-method/v/washer-or-ring-method-for-vertical-line-rotation
HW: Quiz 7.2 on Monday with our last test (7.1, 7.2, & 8.7) on Wednesday, May 13th.
Be nice to your Mom. :)