Answer:
radius = [tex]\sqrt{65}[/tex]
Step-by-step explanation:
The radius of the circle is the distance from the centre to a point on the circumference.
Calculate the radius using the distance formula
r = √(x₂ - x₁ )² + (y₂ - y₁ )²
with (x₁, y₁ ) = (0, 0) and (x₂, y₂ ) = (- 7, - 4)
r = [tex]\sqrt{(-7-0)^2+(-4-0)^2}[/tex] = [tex]\sqrt{49+16}[/tex] = [tex]\sqrt{65}[/tex]
