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To prove that sum of two sides of a triangle minus the th...
by WinpossibleUser3555
to prove that sum of two sides of a triangle minus the third side is less than the third side?
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Suppose the sides of the triangle are a, b and c. So you have to prove a + b – c < c.

Let's re-write above equation as c > a + b – c...(1)

By triangle inequality theorem, a + b > c
a + b > a + b – c. ...(from (1))

So if a, b, c > 0 , then this must be true.

Related video links: Triangle Inequality, Triangle Angle-Sum Theorem
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by Winpossible
Jul 14, 10 11:42PM PST
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