Central and inscribed angles subtended by the same arc

When a central angle and an inscribed angle are subtended by the same arc, they are related.

∠B and ∠D are subtended by the blue arc. What do you notice?

Parallelogram Area

Move point A or point B to create a parallelogram of your choice. Drag point K to the extreme right of the segment.

1.) What is the relationship between the area of the original figure (parallelogram) and the area of the resulting rectangle? 2.) In terms of b and h, what is the area of the rectangle? 3.) Based on questions 1 and 2, what conjecture can you make about the two figures? More than[url=http://mathandmultimedia.com/geogebra/] 50 GeoGebra Tutorials[/url] at [url=http://mathandmultimedia.com/]Math and Multimedia[/url]