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Given :-
- AD = AE
- ∠ BAD = ∠ CAE
To prove :-
- AB = AC
Proof :-
→ ∵ AD = AE
→ ∴ ∠ AED = ∠ ADE
(angles opposite to equal sides)
→ 180 - ∠ AED = 180 - ∠ ADE
Now, since
∠ ADE and ∠ ADB form linear pair and
∠ AED and ∠ AEC form linear pair therefore,
→ ∠ AEC = ∠ ADB ....eqn(1)
Now,
consider Δ ABD and Δ ACE
AD = AE (given)
∠ BAD = ∠ CAE (given)
∠ AEC = ∠ ADB (by eqn (1) )
so, using ASA congruency criterian
Δ ABD = Δ ACE
therefore,
→ AB = AC
(being corresponding parts of congruent triangles)
Proved .
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