If x=12cm and z=20cm, what is the length of Y

Sorry, without additional information or a diagram, it is not possible to determine the length of Y. Please provide further context or clarification.

It's a right triangle

Thank you for the clarification.

If we assume that the values X and Z represent the lengths of the legs of the right triangle, then we can use the Pythagorean theorem to find the value of the hypotenuse Y. The Pythagorean theorem states that:

a^2 + b^2 = c^2

where a and b are the lengths of the legs and c is the length of the hypotenuse.

Substituting the given values X = 12cm and Z = 20cm, we have:

12^2 + b^2 = 20^2

144 + b^2 = 400

b^2 = 400 - 144

b^2 = 256

Taking the square root of both sides:

b = sqrt(256)

b = 16

Therefore, the length of Y (the hypotenuse) is 16cm.

To find the length of Y, we would need more information or equations relating x, y, and z. Without any additional information, it is not possible to determine the length of Y.