SOLUTION: The four sides of a quadrilateral ABCD are tangents to a circle.Prove that mAB+mCD = mBC+mAD.

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Question 1067855: The four sides of a quadrilateral ABCD are tangents to a circle.Prove that mAB+mCD = mBC+mAD.
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
.
See the lesson
    - Quadrilateral circumscribed about a circle
in this site.


Also,  you have this free of charge online textbook on Geometry
    GEOMETRY - YOUR ONLINE TEXTBOOK
in this site.

The referred lesson is the part if this textbook under the topic "Properties of polygons".