Angles Formed by Secants
Notice that line segments AE and CE are secants of this circle.
Drag endpoints A and C to change the measure of angle DEB changes.
Then look at the exploration questions below the image.EXPLORATION
What is the relationship between the arc measures and the angle measure?
As you move points A and C, does this relationship between the angle and arc measures stay the same, no matter where A and C are located?