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Question

Differences of any two sides of a triangle is ........ than the third side

A
May be less or more
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B
More
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C
Equal
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D
Less
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Solution

The correct option is D Less
Let ABC be a triangle,
We can extend BA past A into a straight line,
Then there is a point D such that DA=CA
Therefore, from Isosceles triangle has two equal angles,
ADC=ACD
Thus, in DCB,
BCD>BDC (Side opposite greater angle is larger)
Thus, BD>CD
BA+AD>CD (Since, AC=AD)
BA+AC>CD
AC>CDBA
Thus, difference in two sides is less than the third side.
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