Prove that the exterior angle is equal to the sum of to the remote.
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Step-by-step explanation:
sum of all angles of traingle =180....1
sum of a angle of triangle which is adjacent angle of exterior angle and exterior angle=180..2
........ (angles in linear pair)
hence,
from 1 and 2
eliminating common angle which is other than remote interior anhle and adjacent to exterior angle
we get ,
exterior angle= sum of it's remote interior angle
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