How do you find the point of origin of a circle?

Question

anonymous · Answer

what information were you given?  radius, diameter or ???

anonymous · Answer

The circle shown below is centered at the origin and contains the point (-4, -2).
Which of the following is closest to the length of the diameter of the circle?
a. 13.41 b. 11.66 c. 8.94 d. 4.47

anonymous · Answer

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anonymous · Answer

centered at the origin
that tells you center is (0,0)

anonymous · Answer

use the origin point and point given to find the length of radius.  with radius - double and you will get the diameter

valpey · Answer

Radius will just be the hypotenuse of a 4,2,h triangle.

anonymous · Answer

so c. 8.94?

anonymous · Answer

agreed

anonymous · Answer

Thank you guys so much.

valpey · Answer

Yes, and with the multiple choice, you can skip the calculation step and jump right into estimation by just looking at it.