if two sides of a triangle are unequal ,then the angle opposite to the longer side is larger
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then the opposite side of the trimgle is equal
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Given: △ABC, AB>AC
To Prove: ∠ACB>∠ABC
Construction: Make a point D on AB such that AD=AC and join DC
In △ACD,
AD=AC
∠ACD=∠ADC (Angles opposite to equal sides)
But ∠ADC>∠ABC (Exterior angle of the triangle is greater than the opposite interior angle)
Again, ∠ACB>∠ACD (D lies in interior of ∠ACB)
Thus, ∠ACB>∠ABC
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