CK-12 Geometry - Second Edition

http://www.ck12.org Chapter 9. Circles

32. Suppose thatABis a diameter of a circle centered atO, andCis any other point on the circle. Draw the line
    throughOthat is parallel toAC, and letDbe the point where it meetsBĈ. Prove thatDis the midpoint ofBĈ.

Review Queue Answers

1. 60◦, it is an equilateral triangle.


2. They are congruent because the chords are congruent.
   3.^360
   ◦
   3 =^120

◦

4. The arcs are double each angle.