Arcs & Angles from intersecting Tangents and Secants
Below you are given circle A with secant line ED and tangent line EB intersecting outside the circle. Just like in the previous investigation, move point B, C, D, and E around to test out your hypothesis once you have an idea.
Drag the points/lines around on the circle and observe the angle and arc measurements. What relationship can you identify? (The sum and difference of the arcs shown should help you figure this out)