Question

1. Prove that the difference of the lengths of two sides of a triangle is less...

1. Prove that the difference of the lengths of two sides of a triangle is less than the third side.
2. Prove that in a triangle one side’s median is less than half the sum of the other two sides.
3. Prove that the sum of the lengths of a quadrilateral’s diagonals is less than its perimeter.

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