Find the radius of the circle if the center is at (1, 2) and the point (-3, 4) lies on the
circle.

The distance between these two points is the radius of the circle. The pyth. theorem is useful in solving this problem. You need to construct a right triangle first where the hypotenuse is the length between the points.

The two other side lengths: 1-(-3)=4 and 4-2=2

Now let us use the pyth. theorem to find the hypotenuse:

x^2=4^2+2^2

x^2=20

x=√20

x=2√5

radius = 2√5

the answer is 45 i just did it on oddesy ware