Dustin L. Jones and Max Coleman
Many everyday objects—paper cups, muffins, and flowerpots—are examples of conical frustums. Shouldn’t the volume of such figures have a central place in the geometry curriculum?
S. Louise Gould
Pop-up polyhedra—three-dimensional models that can be stored for future reference—are easily constructed using The Geometer’s Sketchpad and give students experience in using transformations in the plane.
Matt B. Roscoe
Having prospective teachers find the inscribed angle theorem for themselves can foster mathematical reasoning.
Marlena Herman
An introduction to definitions and equations of conic sections can be extended to explain the significance of the
discriminant
.
Barbara M. Kinach
More emphasis on spatial reasoning is a way to increase meaning when students study geometry.