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Tetra Inequalities

Prove that in every tetrahedron there is a vertex such that the three edges meeting there have lengths which could be the sides of a triangle.

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Staircase

Solving the equation x^3 = 3 is easy but what about solving equations with a 'staircase' of powers?

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Proof Sorter - the Square Root of 2 Is Irrational

Try this interactivity to familiarise yourself with the proof that the square root of 2 is irrational. Sort the steps of the proof into the correct order.

Be Reasonable

Stage: 5 Challenge Level: Challenge Level:2 Challenge Level:2

Prove that there is no arithmetic progression containing all three of $\sqrt{2}$, $\sqrt{3}$ and $\sqrt{5}$.