Given a convex quadrilateral ABCD, draw two diagonals, AC and BD, and assume angle ADB = angle ACB show that angle ABD = angle ACD

Question

anonymous · Answer

|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

campbell_st · Answer

can you draw the diagram... as It seems it may be a congruency proof 1st to show the corresponding angles are equal

campbell_st · Answer

|dw:1383808936963:dw|

anonymous · Answer

Yes thank you as the diagonals are AC and BD