Question

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?

25?

Answer 1

distance from endpoint ofdiameter to center is \[\sqrt{(-3 - 0)^2+(-4-0)^2} \implies\sqrt{9 + 16} \implies \sqrt{25} \implies 5\]
so the radius is equal to 5..what do you think is the diameter then?

Answer 2

10

Answer 3

sorry, that was wrong.. :-p

Answer 4

right