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Home › Math Calculators › Right Triangle Calculator

Right Triangle Calculator

Solve a right triangle given two known values.

Geometry
Leg a (opposite to angle A). Leave blank to calculate.
Leg b (adjacent to angle A). Leave blank to calculate.
Longest side. Leave blank to calculate.
Acute angle opposite side a. Leave blank to calculate.
Formula
a²+b²=c², sin A=a/c, cos A=b/c, tan A=a/b
Enter two sides (a, b, or c) or one side and one acute angle (in degrees) to solve the triangle completely.

Result

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Calculation Breakdown

STEP-BY-STEP DETAILS

ParameterValue
Result—

About Right Triangle Calculator

A right triangle has one 90° angle. Given any two independent pieces of information (sides or angles), all remaining sides and angles can be determined using the Pythagorean theorem and trigonometric ratios.

ℹ️ About Right Triangle Calculator

Calculate all sides and angles of a right triangle from any two known values. Uses trigonometry and Pythagorean theorem.

📋 How to Use

  1. Enter the required values in the input fields.
  2. Select the operation type if multiple options are available.
  3. Click Calculate.
  4. View the result and step-by-step breakdown.

🔢 Formula / Calculation Method

a² + b² = c² | sin(θ) = opposite/hypotenuse

Side a=3, angle=30° → find all other sides

👥 Who Uses It

  • Students solving math homework
  • Teachers creating lesson examples
  • Engineers and scientists
  • Finance professionals
  • Programmers and developers

📌 Practical Examples

Example 1
Side a=3, angle=30° → find all other sides
Verification
Use the formula shown to manually verify the result.
Real World
Apply the result to your specific problem.
Study Aid
Practice with different input values to learn.

⭐ Benefits

🎯
Accurate
Mathematically precise results
⚡
Instant
No waiting for calculations
📋
Formula
Understand the math behind it
📱
Mobile
Works on any device
🆓
Free
No cost or registration
📊
Breakdown
Step-by-step where possible

💡 Tips

  • 💡Double-check your input values before calculating.
  • 💡Use the formula shown to understand how the result is derived.
  • 💡For decimals, use a period (.) as the decimal separator.
  • 💡Try different values to understand how the result changes.

❓ Frequently Asked Questions

How accurate is the result?
Results use JavaScript's 64-bit floating point — accurate to 15+ significant digits for most calculations.
Can I enter decimal numbers?
Yes, decimals are fully supported.
Is it free?
Yes, completely free.
Does it show the formula?
Yes, the formula is displayed on the page.
Can I use it on mobile?
Yes, the calculator is fully responsive.
Does it save my inputs?
No data is stored — all calculations are done locally in your browser.
What if I get an error?
Check for invalid inputs such as division by zero or negative square roots.

🔗 Related Calculators

🔢Scientific Calculator 📊Percentage Calculator 📐Pythagorean Theorem 📉Standard Deviation 🔢Fractions Calculator ➕Addition Calculator

🚀 Features

⚡
Instant Results
Calculate in seconds, no waiting
🎯
High Accuracy
Precise results every time
📱
Mobile Friendly
Works on any device or screen size
🔒
Privacy First
No data stored or shared
🌍
Works Worldwide
Available 24/7 from anywhere
🆓
100% Free
Always free, no registration needed

⚠️ Common Mistakes to Avoid

  • ⚠️Entering values in the wrong fields.
  • ⚠️Using commas instead of periods as decimal separators.
  • ⚠️Dividing by zero — this is undefined.
  • ⚠️Not selecting the correct mode (degrees vs radians for trig).

📢 Disclaimer

Results are provided for informational purposes only and should be verified before making important financial, academic, or engineering decisions.