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Theorems
Theorem 6.2 Important Deleted for CBSE Board 2023 Exams
Theorem 6.3 Deleted for CBSE Board 2023 Exams
Theorem 6.4 Deleted for CBSE Board 2023 Exams
Theorem 6.5 Important Deleted for CBSE Board 2023 Exams
Theorem 6.6
Theorem 6.7 Important Deleted for CBSE Board 2023 Exams You are here
Theorem 6.8 Deleted for CBSE Board 2023 Exams
Last updated at March 16, 2023 by Teachoo
Theorem 6.7 :- The sum of all angles are triangle is 180°. Given :- Δ PQR with angles ∠1, ∠2 and ∠3 Prove :- ∠1 + ∠2 + ∠3 = 180° Construction:- Draw a line XY passing through P parallel to QR Proof: Also, for line XY ∠1 + ∠4 + ∠5 = 180° ∠1 + ∠2 + ∠3 = 180° Hence, sum of all angle of a triangles are equal. Hence proved