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OpenStudy (anonymous):
Given a convex quadrilateral ABCD, draw two diagonals, AC and BD, and assume angle ADB = angle ACB show that angle ABD = angle ACD
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OpenStudy (anonymous):
|dw:1383808875311:dw| I know I will use the circumcircle formed by ABD, but I don't know how to show that C must be on the circumcircle as well
OpenStudy (campbell_st):
can you draw the diagram... as It seems it may be a congruency proof 1st to show the corresponding angles are equal
OpenStudy (campbell_st):
|dw:1383808936963:dw|
OpenStudy (anonymous):
Yes thank you as the diagonals are AC and BD
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