Friday, May 29, 2009

Circle Theorems 6 and 7

Today we went over the last two circle theorems. We have been doing this all week and the rest of them are saved in the courswork drive.
Circle Theorem #6:
If a quadrilateral is cyclic, then the opposite angles are supplementary

*Meaning that the angles that are opposite each other always add up to 180 degrees.

Cirle Theorem #7:

If two lines are tangent to the same circle, and intersect in the exterior of the circle, then the line segments created by the point and points of tangency are congruent.

* So pretty much the lines are the same.

We then continued to do practice questions.

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