Right Triangle Angle Calculator
Calculate an acute angle from opposite and adjacent side lengths.
Right Triangle Angle measurements
Enter your values, then calculate.
Result
How to calculate right triangle angle
Find an acute angle in a right triangle when the opposite and adjacent side lengths are known.
How the calculation works
The tangent of the angle equals opposite ÷ adjacent. Applying inverse tangent and converting radians to degrees gives the angle.
Example
An opposite side of 6 and adjacent side of 8 produce an angle of approximately 36.87°.
Frequently asked questions
Where is the hypotenuse used?
It is not needed when both opposite and adjacent sides are known.
Right Triangle Angle Calculator
The tangent of the angle equals opposite ÷ adjacent. Applying inverse tangent and converting radians to degrees gives the angle.
Let's understand your right triangle angle result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Right Triangle Angle
- Use side lengths measured from the same angle.
- The two sides may use any unit as long as both use the same one.
Common Right Triangle Angle Mistakes to Avoid
- Swapping opposite and adjacent returns the complementary angle rather than the intended angle.
When to Use This Calculator
Find an acute angle in a right triangle when the opposite and adjacent side lengths are known.