Question

If the hypotenuse of an isosceles right triangle is 12 cm what are the measurements of the legs

Answer 1

That is a 45 45 90 triangle.
In such a triangle, the legs equal the hypotenuse divided by sq root (2)
So, each leg = 12 / 1.4142135624
which equals 8.4852813742
or about 8.5 cm

Source:
http://www.1728.org/trig2.htm