### Why use Sketchpad?

North Carolina's InfoWeb on High School Geometry
states that appropriate technology,
from manipulatives to calculators and graphics software, should be
used regularly for instruction and assessment.
Technology Portfolio Requirement for NC certification.

### Sketchpad Activities to Acompany Roads to Geometry

Assignment 1: Draw anything, explain using text within your sketchpad
document, and create and accompanying script.
Proof that all triangles have angle sum 180 degrees in sketchpad (ie
mainly text, but each group moved stuff around and incorporated my suggestions
into their proof until is was approved as clear and elegant).
Visualizing Higher Dimensions:
Hypercube

Tom Banchoff:

klein bottle

Flat Torus in the Three-Sphere

The Math Forum's Elliptic Geometry Drawing Tools
The Math Forum's Poincare Disk Drawing Tools
Dan Bennet's Half Plane Model of Non-Euclidean Geometry