proving theorems

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I already have answers a-d, e. is the only one that's giving me trouble...I've gone to three different people and I don't know...can anyone help?

To prove that AD is the bisector of <XAY, give a reason for each statement.

ANEWMATHPIC.jpg

a.)AB is congruent to AC and BD is congruent to CD = B&C are midpoints of AX & AD

b.)AD is congruent to AD = a segment is congruent to itself

c.)^(<- that's a triangle) ^ABD is congruent to ^ ACD =SSS

d.) <BAD is congruent to <CAD =AD bisects <A

e.)AD is the bisector of <XAY.=
 
Use part c. We have \(\displaystyle \angle BAD \equiv \angle CAD.\)
 
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