Question

Which one of the following equations represents a circle with its center of origin?

A) x^2 + y^2 = 5
B) x^2 + y = 25
C) x + y = 5
D) x/2 + y/2 = 25

Answer 1

• A) x² + y² = 5

Explanation:

The equation of the circle:

• (x - h)² + (y - k)² = r²

The center is (h, k)

Wen the center is the origin we have, h = 0, k = 0:

• x² + y² = r²

The only equation in same format is the first one