Question

What is the radius of a circle whose equation is (x + 5)2 + (y – 3)2 = 42? 2 units 4 units 8 units 16 units

Answer 1

B) 4 units

Explanation:

Edge 2020

Answer 2

Option B.

Explanation:

The given equation is

`(x+5)^2+(y-3)^2=4^2` ...(1)

The standard form of a circle is

`(x-h)^2+(y-k)^2=r^2` ...(2)

where, (h,k) is center and r is radius of the circle.

On comparing (1) and (2) we get

`h=-5,k=3,r=4`

It means center of the circle is (-5,3) and radius of the circle is 4 units.

Therefore, the correct option is B.