Question

The point (-1,2) is on the circle whose center is (4,1). What is the radius?

Answer 1

(4,1) (-1, 2)
Distance = Square Root ( (X difference)^2 + (Y difference)^2 )

Distance = Square Root ((5^2) + (1 -2)^2)
Distance = Square Root ((25) + (-1^2))
Distance = Square Root (25 +1)
Distance = Square Root 26
Radius = 5.0990195136