Which of the following provides sufficient information to write the equation of any circle?
the x-intercept
the y-intercept
coordinates of the center
radius and coordinates of the center

Question

Which of the following provides sufficient information to write the equation of any circle?      
       the x-intercept
       the y-intercept
       coordinates of the center
       radius and coordinates of the center

zepdrix · Answer

|dw:1428701559678:dw|The intercepts don't really give us enough information.
Yes, they tell us where the circle crosses the axes, but it doesn't give us any idea about the size of the circle. We can't find the center of the circle with just one intercept.

Hmm what do you think, any ideas? :d
What is a really important feature of a circle?