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Mathematics 13 Online
OpenStudy (anonymous):

Four tangents are drawn from E to two concentric circles. A, B, C, and D are the points of tangency. Name as many pairs of congruent triangles as possible and tell how you can show each pair congruent.

OpenStudy (anonymous):

OpenStudy (anonymous):

@Directrix

Directrix (directrix):

A little late but some insight on this problem. Read all the posts on the thread. http://openstudy.com/updates/51ff1dc0e4b0cc46c14b13ce

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