Final answer:
To convert the rectangular equation x² + y² = 4 to polar form, we can rewrite it as r² = 4 and take the square root of both sides to get r = 2.
Step-by-step explanation:
To convert the given rectangular equation to polar form, we can use the relationships between rectangular coordinates and polar coordinates. The polar coordinates (r, theta) represent the distance from the origin and the angle with the positive x-axis, respectively. In this case, the equation x^2 + y^2 = 4 can be rewritten as r^2 = 4, where r is the distance from the origin. Taking the square root of both sides, we get r = 2. Thus, the polar form of the equation is r = 2.