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Angle Bisector
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of a Triangle
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teachoo.com
Theorem 6.7 - Prove that sum of angles of triangles is 180 - Class 9
Theorem 6.7 :-The sum of all angles are triangle is 180°.Given :- Δ PQR with angles ∠1, ∠2 and ∠3Prove :- ∠1 ∠2 ∠3 = 180° Construction:- Draw a line XY passing through P parallel to QRProof: Also, for line XY∠1 ∠4 ∠5 = 180°∠1
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