CBSE Class 9 Answered
In fig., l||m, show that 
1 + 2 - 3 = 180o
1 + 2 - 3 = 180o
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
Given: l||m
To prove: 
1 + 2 - 3 = 180o
Construction: Draw XC||AB and extend AB to Y.
Proof:
BCX = 180o - 1 (sum of int. s on same side of transversal is 180o)
XCD = 3 (Alternate int. s)
Now, 2 = BCX + XCD
Or, 2 = (180o - 1) + 3
1 + 2 - 3 = 180o
Answered by | 04 Jun, 2014, 03:23: PM
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