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Question

How we are getting angles 1+2+3=180


Solution

I think you are talking about triangles
consider a ΔABC,

Draw a line MN parallel to BC.
3=5 (Alternate interior \angle s)
& 2=4 (Alternate interior \angle s)
Now, 4+1+5=180 (Linear pair)
1+2+3=180

 

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