Question

Which explains how to find the radius of a circle whose equation is in the form x2 + y2 = z?

The radius is the constant term, z.
The radius is the constant term, z, divided by 2.
The radius is the square root of the constant term, z.
The radius is the square of the constant term, z.

Answer 1

The radius is the square root of the constant term, z.

Reason: x^2 + y^2 = z is in the form x^2 + y^2 = r^2, so r = √z (with z ≥ 0 for a real circle).