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Right Triangle Calculator
Solve right triangles using the Pythagorean theorem and trigonometry
Right Triangle Solver
Side a
Side b
Hypotenuse (c)
Angle A (°)
Angle B (°)
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Right Triangle Formulas
Pythagorean Theorem
• a² + b² = c²
• c = √(a² + b²)
• a = √(c² - b²)
• b = √(c² - a²)
Trigonometric Ratios
• sin(A) = opposite/hypotenuse = a/c
• cos(A) = adjacent/hypotenuse = b/c
• tan(A) = opposite/adjacent = a/b
• A + B = 90° (complementary angles)
Frequently Asked Questions
What is a right triangle?
A right triangle is a triangle with one 90-degree angle. The side opposite the right angle is called the hypotenuse, and it's always the longest side.
How do I use the Pythagorean theorem?
What are the basic trigonometric ratios?
Can I solve a right triangle with just one side and one angle?
Tips
Enter the dimensions in the same unit for consistency.
Results update automatically as you type.
Use the unit selector to convert between different measurement systems.