Question

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

Answer 1

4.47

Explanation:

Add me on instagram at skyy.thatdancer

Answer 2

2√5

Explanation:

The radius is the distance from the center to a point anywhere along the edge of the circle. To find the distance between these two points, use the distance formula.

`d = √((x_2-x_1)^2 + (y_2-y_1)^2) \\d = √((1--3)^2 + (2-4)^2)\\ d = √(4^2 + -2^2)\\ d = √(16 + 4)\\ d = √(20) \\d = 2√(5)`