- Matt James
- Slopes of parallel lines
- Slopes of Perpendicular Lines
- Points of Concurrency
- Station 2 - Orthocenter Activity
- Circumcenter Activity
- Lengths of parts of medians using the centroid
- Exterior Angle Inequality
- Angle from Side and Side from Angle Inequalities
- Triangle Side Inequality
- Triangle Proportionality Theorem
- Proportional segments of parallel lines
- Proportional segments by the angle bisector of triangle
- Pythagorean Theorem Proof
- Pythagorean Theorem Proof 2
- Classifying Triangles from the Pythagorean Theorem
- Altitude Forms Similar Triangles Animation
- Right Triangle Altitude Ratios
- Solving Right Triangles Quiz
- Interior Angles of Polygons
- Translation
- Coordinate Notation Translation Quiz
- Rotation of points in a triangle quiz
- Double Reflection Over Parallel Lines
- Double Reflection Over Intersecting Lines
- Congruent chords in a circle
- Finding the diameter of a broken dinner plate
- measure of inscribed angles = 1/2 the intercepted arc
- Demonstration of the Inscribed Angle
- Arc with Tangent Measures - Quiz
- Angle Measures from Intersection inside circle
- Finding Measures of Tangent/Secant Arcs
- intersection of secants, chords, and tangents of a circle
- Length of Chords, Secant Segments, and Tangent Segments
- formula for Area and Perimeter of Circle
- Finding the Area of a regular polygon
- Rotating Pyramid