I am not sure if this will help but you can use Pythagorean Theorem which is a squared + b squared = c squared.
A^2 and b^2 would be the legs of the triangle and c^2 would be the hypotenuse.
You need two numbers for this though. I’m sorry if this doesn’t help.
A right angle triangle can be used to prove the Pythagorean theorem as (The length of the hypotenuse which is the long side is equal to the other sides of the triangle ). AC^2 =AB^2+BC^2
The answer will probably be -0.665
Do you still need help on this?