Which if the following is an undefined term? a) angle b) line c) ray d) vertex

For this case we have to:

Angle: It is the space that is formed between two lines that start from the same point.

Line: It is the infinite succession of points. The lines extend in the same direction.

Vertice: The point that joins the segments of two or more one-dimensional elements is called.

The undefined word in this case is: Ray

Ray

square root of 36/6 = 2.449489743

square root of 16/6 = 1.632993162

square root of 6 = 2.449489743

the answer is square root of 16/6 because the square root of 36/6 is the same answer as square root of 6 = 2.449489743