Question

A circle is centered at the origin and contains the point (-4,-2). What is the length of the radius of the circle?

0 V6
0 20
20
O 12

Answer 1

Explanation:
Equation for circle centered at origin:
x² + y² = r².
r² = (-4)² + (-2)² = 20, r = √20

Answer 2

0 20

Explanation:

x2 + y2 = r2 , and this is the equation of a circle of radius r whose centre is the origin O(0, 0). The equation of a circle of radius r and centre the origin is x2 + y2 = r2 .