Right Triangle Calculator
Solve any right triangle from two known values (sides or angles). Computes all sides, angles, area, perimeter, and altitude.
Right triangle
Enter any two values. Sides a and b are the legs, c is the hypotenuse. Angle A is opposite leg a, angle B is opposite leg b (both in degrees).
Enter any two values to solve the triangle.
Frequently Asked Questions about the Right Triangle Calculator
What is a right triangle?
A triangle with one 90 degree angle. The side opposite the right angle is the hypotenuse; the other two are legs.
How does the Pythagorean theorem work?
For legs a, b and hypotenuse c: a^2 + b^2 = c^2. Given any two sides, the third follows.
What is SOH-CAH-TOA?
Memory aid for right-triangle trigonometry. Sin = Opposite/Hypotenuse, Cos = Adjacent/Hypotenuse, Tan = Opposite/Adjacent.
What is a 30-60-90 triangle?
Sides are in ratio 1 : sqrt(3) : 2. Shortest side opposite 30 degrees, hypotenuse opposite 90 degrees.
What is a 45-45-90 triangle?
Isosceles right triangle with sides in ratio 1 : 1 : sqrt(2). Both legs equal, hypotenuse is leg times sqrt(2).