Special right triangles. A special right triangle is a right triangle with some regular feature that makes calculations on the triangle easier, or for which simple formulas exist. For example, a right triangle may have angles that form a simple ratio, such as 45-45-90. This is called an "angle based" right triangle.
X = 0
I hope this helps you in some way. :)
It would be basically 2.12 because once you divide it your answer will be that