Right Triangle Angle Calculator
Find both acute angles and the hypotenuse of a right-angled triangle from the two shorter sides. Enter opposite side and adjacent side to see angle…
8 of 8 free uses remaining today
Find both acute angles and the hypotenuse of a right-angled triangle from the two shorter sides. Enter opposite side and adjacent side to see angle a, angle b and hypotenuse when you calculate.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (opposite side = 3, adjacent side = 4), the results are: angle A 36.87 °; angle B 53.13 °; hypotenuse 5.000.
Quick reference: opposite side vs result
Reference table based on the example values; it is not your calculation result.
| Opposite side | Angle A | Angle B | Hypotenuse |
|---|---|---|---|
| 1.5 | 20.56 ° | 69.44 ° | 4.272 |
| 3 | 36.87 ° | 53.13 ° | 5.000 |
| 6 | 56.31 ° | 33.69 ° | 7.211 |
| 15 | 75.07 ° | 14.93 ° | 15.524 |
| 30 | 82.41 ° | 7.59 ° | 30.265 |
| 60 | 86.19 ° | 3.81 ° | 60.133 |
Frequently asked questions
What formula does this calculator use?
Angle A = atan(a ÷ b) × 180 ÷ pi; Angle B = 90-atan(a ÷ b) × 180 ÷ pi; Hypotenuse = sqrt(a^2+b^2). Variables: a = opposite side, b = adjacent side.
What do I need to enter?
You need opposite side, adjacent side. Results update as you type.
What is an example result?
With the default inputs (opposite side = 3, adjacent side = 4), the results are: angle A 36.87 °; angle B 53.13 °; hypotenuse 5.000.
Related Tools
View allCircle Area Calculator
Calculate the area and circumference of a circle from its radius. Enter the radius in any unit and the results use the same unit squared for area.
Rectangle Area and Perimeter Calculator
Find the area and perimeter of a rectangle from its length and width. Use any consistent unit, and the area is returned in that unit squared.
Triangle Area Calculator
Calculate the area of a triangle from its base and perpendicular height. Enter both measurements in the same unit to get the area in that unit squared.
Pythagorean Theorem Calculator
Find the hypotenuse of a right-angled triangle from the two shorter sides. Enter sides a and b, and the calculator returns c using the formula a…