CBSE Class 9 Answered
The side BC of 
ABC is produced on both sides. Prove that the sum of the two exterior angles so formed is greater than 
A by 180o.
ABC is produced on both sides. Prove that the sum of the two exterior angles so formed is greater than A by 180o.
Asked by Topperlearning User | 11 Aug, 2017, 09:11: AM
Expert Answer
Given: Side BC of ABC is produced on both sides.
To prove: ext B + ext C > A
Proof:
ext B + ext C = 180o -B + 180o - C
= 360o - (B + C)
= 360o - (180o - A)
= 180o + A
Hence, ext B + ext C > A.
Answered by | 11 Aug, 2017, 11:11: AM
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