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  • Brainly User
2016-03-16T17:11:12+05:30
EXTEND SIDE    AB TO E AND JOIN CE. LET ANGLE CBE=1
AND ANGLE BEC =2.
NOW ,ANGLE A+ANGLE 2 =180 (1)
ANGLE B+ ANGLE 1= 180  (2)
 FROM   EQUATION 1 AND 2
ANGLE A = ANGLE B,
HENCE PROVED

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