How we worked it out
Updated as you change the numbers.
- Pythagorean theorem: a² + b² = c².
- Angles: tan A = a ÷ b; B = 90° − A.
Method and assumptions
In a right triangle the square of the hypotenuse equals the sum of the squares of the legs. Sine, cosine and tangent relate the angles to the sides. A 3-4-5 triangle is the classic check for square corners in building.
Questions
What is the hypotenuse of a triangle with legs 3 and 4?
5.
Sources
Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.