In right-angled triangles the square on the side subtending the right angle is equal to the squares on the sides containing the right angle.

Sire, there is no royal road to geometry.

Things which are equal to the same thing are also equal to one another.

Give him threepence, since he must make a gain out of what he learns.

A line is length without breadth.

Better balance, less pain and less restless leg syndrome.

And the whole is greater than the part.