Pythagoras Triangle Check
Right, acute, or obtuse from three sides.
Triangle is
right
a² + b² = c² (right triangle)
a² + b² = 25.00
c² = 25.00
For a right triangle: c = 5.0000
Common Pythagorean triples
- 3, 4, 5
- 5, 12, 13
- 8, 15, 17
- 7, 24, 25
- 20, 21, 29
- 9, 40, 41
- 12, 35, 37
- 11, 60, 61
Pythagorean theorem with a comparison: tells you whether a triangle with given sides is right, acute, or obtuse. Useful for carpentry (3-4-5 squaring) and quick geometry checks.
About
Enter three sides. The tool checks a² + b² vs c². Equal = right triangle. Sum of squares larger = acute triangle. Smaller = obtuse. Includes a list of common Pythagorean triples.
How to use
- Enter three sides.
FAQ
Why does carpentry use 3-4-5?+
It's the smallest Pythagorean triple. Lay out 3 ft, 4 ft, and check the diagonal is exactly 5 ft - your corner is square.