GraphicMaths Pythagoras Triangle Solver
By Martin McBride,
2026-10-09
Tags:
pythagoras
triangles
Categories: geometry
A right-angled triangle has three sides, a, b and c (where c is the hypotenuse). If you know the lengths of two of the sides, this calculator will find the third side, using Pythagoras' theorem.
Enter the lengths of any the two known sides. Leave the unknown side blank to calculate the length of unknown side. More...
For example, if you know that side a has length 4, and side c (the hypotenuse) has length 5, then enter the values 4 and 5 into boxes a and c. You must leave box b blank.
The third side is calculate using Pythagoras' theorem: $$ a^2 + b^2 = c^2 $$
| Side a | |
| Side b | |
| Side c | |
