easy
the radius is the distance from the center to a point on the circle
we are given
center=(7,1)
a point=(8,7)
find the distance
distance formula
D=[tex] \sqrt{(x2-x1)^2+(y2-y1)^2} [/tex]
so the distance between point and center is radius
D=[tex] \sqrt{(8-7)^2+(7-1)^2} [/tex]
D=[tex] \sqrt{(1)^2+(6)^2} [/tex]
D=[tex] \sqrt{1+36} [/tex]
D=√37 units
radius is √37 units
