Exterior Angles of a Circle

Jenni McIntire and Teresa Davis


This lab is to investigate the measure of an angle on the exterior of a circle.


Investigation:
In Sketchpad,, make the following construction.

Try adding, subtracting, multiplying, and dividing to find a relationship between the angle and its intercepted arcs.

Write a formula for the measure of an exterior angle of a circle in relationship to the intercepted arcs.

Exterior Angle = ___________________


Fill in the chart:

Vertex of Angle Angle Measure

 On the Center

 Angle = _______________

 On the Circle

  Angle = _______________

 Interior of Circle

  Angle = _______________

 Exterior of Circle

  Angle = _______________

Check chart with your teacher before starting the exercises.


Exercises:


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