What is the radius of a circle whose equation is x2 + y2 + 8x – 6y + 21 = 0?

2 units

Step-by-step explanation:

The given equation of the circle is:

The general equation of the circle is:

Comparing the given equation with the general equation we can say:

g = 4

f = -3

c = 21

The formula for radius of the circle is:

Using these values of the given circle, we get:

Therefore, the length of radius of the given circle is 2.

1. 8

2. 9

3. 20

4. 3

5. 17

6. 2.2

7. 11.25

8. 1

9. 14

10. 2

step-by-step explanation:

thats the first half