Question

What is the radius of the circle: (x+1)^2+(y-12)^2=25

1. (-1, 12)
2. 5
3. 25
4. (1, -12)

Answer 1

Radius= 5 radius=5 radius= 5 radius= 5

Answer 2

radius = 5

Explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

Here r² = 25 ( take the square root of both sides )

r =
`√(25)` = 5