Question

A circle whose center is at (1, -3) passes through (7, 5). What is the length of the radius of the circle?

Answer 1

you want to find the distance of the line from (1, -3) to (7, 5).

don't worry about the circle or radius part, they threw that in there to confuse you.

going from (1, -3) to (7, 5), you increase your x value by 6 and your y value by 8

so we can set up a right triangle that has the sides of 6 and 8, where your answer is the length of the hypotenuse



solve for the hypotenuse