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=\(\sqrt{(x2-x1)^2+(y2-y1)^2}\)
so the distance between point and center is radius
D=\(\sqrt{(8-7)^2+(7-1)^2}\)
D=\(\sqrt{(1)^2+(6)^2}\)
D=\(\sqrt{1+36}\)
D=√37 units
radius is √37 units
