Right triangle calculator
Enter two values (at least one side) and leave the rest empty. α is the angle opposite leg a.
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How it is calculated
c² = a² + b²
sin α = a / c cos α = b / c tan α = a / b
The two acute angles add up to 90°. Any two values (one of them a side) are enough to find all the others.
Frequently asked questions
What is the hypotenuse with legs 3 and 4?
5, the classic 3-4-5 triangle.
How do I check that a corner is square?
Mark 3 ft on one side and 4 ft on the other: the diagonal should be exactly 5 ft.