Posted by Rayne on Monday, October 1, 2012 at 8:31pm.
True or False:
If a ray bisects an angle of a triangle, then it also bisects the side opposite the angle.
If a plane intersects a cylinder, then the intersection must be a circle.
I think the first one is true and the second one is false.

Geometry  Reiny, Monday, October 1, 2012 at 9:14pm
both false.
To be true it must be true for ALL cases
First one is true only if you have an isosceles triangle or an equilateral triangle
For the second, if the intersecting plane is not parallel to the base of the cylinder, you will get an ellipse
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