Pythagoras's Theorem
In any rightangled triangle, the square of the hypotenuse is equal to the
sum of the squares of the other two sides. i.e.: c² = a² + b² in the
following diagram:
Example
Find AC in the diagram below.
AB² + AC² = BC² AC² =
BC²  AB² = 13²  5² = 169  25 = 144 AC =
12cm
Copyright © Matthew Pinkney 2003
