Question

A circle has its center at the origin, and (5, -12) is a point on the circle. How long is the radius of the circle?

Answer 1

Find the distance between (0, 0) and (5, -12)

Answer 2

how do i do that?

Answer 3

Use the distance formula.

Answer 4

Yes. Use th edistance formula.
√(5^2 + (-12)^2)
√(25 + 144)
√169
13

Answer 5

The center of a circle is at the origin. An endpoint of a diameter of the circle is at (-3, -4). How long is the diameter of the circle?.......... okay how would i do the diameter?

Answer 6

Same thing except you double the radius...

Answer 7

whats the fromula again?