
- An isosceles triangle ABC
- AD is a bisector of ∠A
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- By ASA criteria ∆ABD congurant to ∆ADC
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- By CPCT ( corresponding parts of congurant triangle )

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Answer:
very cool dude
Step-by-step explanation:
Actually i just forgot it brooo
Well, is namely their difference, so, let's first convert the mixed fractions to "improper", and subtract.
B has the same denominator so there is your answer