Answer:
radius = 2 sqrt(5)
Explanation:
We can find the radius from the endpoints
The diameter is the distance between the endpoint
The distance between a and b is
d = sqrt( (x2-x1)^2 + (y2-y1)^2)
= sqrt((11-3)^2 +(-8--4)^2)
= sqrt((8^2+ (-8+4)^2)
= sqrt(64+-4^2)
= sqrt(64+16)
= sqrt(80)
We know that sqrt(a b) = sqrt(a) sqrt(b)
sqrt(80) = sqrt(16) sqrt(5)
4sqrt(5)
This is the diameter
The radius is 1/2 the diameter
radius =1/2 (4 sqrt(5))
radius = 2 sqrt(5)
They did not list the radius. There is an error with the problem