Answer:
Step-by-step explanation:
The main equivalence between rectangular and polar forms is
x^2 + y^2 = r^2, where r is the radius. Next, y = r sin Ф. Thus,
x^2 + y^2 = r^2 becomes r² = 2·r·sin Ф.
The variable r can be factored out partially: r = 2·sin Ф
This is the polar form of x^2 + y^2 = 2y.
