This calculator finds missing sides and angles of a right triangle for students, builders, and anyone checking a diagonal.
The interactive right triangle calculator loads right here. If it hasn't appeared, refresh the page.
Enter two known sides, or one side and one acute angle. Identify the hypotenuse correctly: it is the longest side and sits opposite the 90-degree angle.
For legs a and b and hypotenuse c, the side formula is c^2 = a^2 + b^2. For angle A, sin(A) = opposite / hypotenuse, cos(A) = adjacent / hypotenuse, and tan(A) = opposite / adjacent.
A right triangle with legs of 6 m and 8 m has a hypotenuse of square root of (6^2 + 8^2) = 10 m. The angle opposite the 6 m side is arcsin(6 / 10) = 36.87 degrees, and the other acute angle is 53.13 degrees.
Yes. Besides the known 90-degree angle, you need at least two measurements, including at least one side.
Every triangle's angles total 180 degrees. Since a right triangle already contains a 90-degree angle, the other two must total 90 degrees.
More from DoesWhat: free calculators · emoji meanings · quick answers · the DoesWhat blog