i have two reasons left in my proof. anyone wanna help? medal included, and so is pic :)

Question

i have two reasons left in my proof.  anyone wanna help? medal included, and so is pic :)

anonymous · Answer

|dw:1356036403480:dw|

anonymous · Answer

BAD = CAD _______
BD = CD ________

i need both those reasons :) thanks

anonymous · Answer

because it is symmetrical about the y axis everything to the left of the centreline is the same as everything to the right of it. If you reflect BAD in the y axis it becomes CAD therefore we prove they must be equal. so they have the same length. the same argument can be used to explain why BD = CD

anonymous · Answer

so what would i write? like symmetrical property?

anonymous · Answer

yeah that's what i would do. You're not given much to go from so they cant be expecting more than that.

anonymous · Answer

meh, if i fail i fail, i dont mind.  thanks :)