Texas Essential Knowledge and Skills
Geometry
Dimensionality and the Geometry of Location
7. The student understands that coordinate systems provide convenient and efficient ways of representing geometric figures and uses them accordingly.
Lessons (1)
This lesson utilizes the concepts of cross-sections of three-dimensional figures to demonstrate the derivation of two-dimensional shapes.
Activities (2)
Build your own polygon and transform it in the Cartesian coordinate system. Experiment with reflections across any line, revolving around any line (which yields a 3-D image), rotations about any point, and translations in any direction.
Explore cross sections of different geometric solids: cone, double cone, cylinder, pyramid, and prism. Manipulate the cross section with slider bars, and see how the graphical representation changes.