Right Triangle Side & Angle Calculator
Give any two of: leg a, leg b, hypotenuse c, or angle A — the calculator solves everything else.
Fill exactly two boxes; leave the rest empty.
How It Works
With any two independent values, a right triangle is fully determined. Two sides use the Pythagorean theorem (a² + b² = c²); a side plus an acute angle uses sine, cosine, or tangent. Angle A is taken opposite leg a.
Frequently Asked Questions
Which side is the hypotenuse?
Side c — always opposite the right angle and always the longest side.
Why must angle A be under 90°?
The other two angles of a right triangle are acute; they add to exactly 90°.
Can it solve from the two acute angles alone?
No — angles fix only the shape, not the size. At least one side length is required.