Right Triangle Calculator
Solve a right triangle from any two sides or a side and angle (SOHCAHTOA).
Inputs
Provide any two known values; leave the rest blank
Solution
Enter values and click solve.
SOHCAHTOA
Sine = Opposite/Hypotenuse, Cosine = Adjacent/Hypotenuse, Tangent = Opposite/Adjacent.
Combined with the Pythagorean theorem (a² + b² = c²), these three ratios let you solve any right triangle from two known parts.
Frequently Asked Questions
What inputs do I need?▾
You need any 2 of the following: sides a, b, c (where c is the hypotenuse) or non-right angles A and B. The calculator finds everything else.
What is SOHCAHTOA?▾
A mnemonic: Sine = Opposite/Hypotenuse, Cosine = Adjacent/Hypotenuse, Tangent = Opposite/Adjacent. It encodes the three primary trig ratios.
What if I know one leg and the hypotenuse?▾
Use the Pythagorean theorem: missing leg = √(c² − leg²). The angles come from inverse sine or cosine of the ratio.
Can a right triangle be isosceles?▾
Yes — a 45-45-90 triangle has two equal legs and a hypotenuse √2 times the leg length.