Right Triangle Calculator
Find missing sides and angles of a right triangle. Enter two known values.
Side a
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Side b
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Hypotenuse c
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Area
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Angle A
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Angle B
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Solving Right Triangles
A right triangle has one 90° angle. The longest side (opposite the right angle) is called the hypotenuse.
Pythagorean Theorem
a² + b² = c²
SOH CAH TOA
- SOH: Sin = Opposite / Hypotenuse
- CAH: Cos = Adjacent / Hypotenuse
- TOA: Tan = Opposite / Adjacent
Example: 3-4-5 Triangle
- Sides: 3, 4, 5
- Angles: 36.87°, 53.13°, 90°
- Area: (3 × 4) / 2 = 6
Frequently Asked Questions
How do I find the hypotenuse?
Use the Pythagorean theorem: c = √(a² + b²). For example, if the legs are 3 and 4, then c = √(9 + 16) = √25 = 5.