May 8, 2017
Rotate this polygon about the y-axis and
find the volume created
HGeo Rotation 1.gsp
Frustum:the portion of a cone or pyramid
that remains after its upper part has been
cut off by a plane parallel to its base, or
that is intercepted between two such
planes.
Find the volume of the solid created
when rotating the area about the line.
rotation half circles 2.gsp
What do we know about the two bases?
Original and the new base created?
May 8, 2017
What is the scale factor of the bases?
Find their slant heights
Use the slant heights to find the heights
Now find the volume of each
Find the volume of the frustum.