Determine the missing angle measures of quadrilaterals inscribed in circles.

Explore and measure a variety of quadrilaterals.

This activity is used to discover that the sum of the measures of the triangle angles is constant and to discover ways of proving the theorem listed in the activity.

[Free Registration/Login Required] Students are given an Isosceles triangle and are asked to move the point on the line segment to explore how the angle measure changes. Click learn more to watch a video demonstration and click challenge...

A succinct test for assessing geometry concepts. Assessment is scored online giving immediate feedback. An excellent assessment tool.