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The problems you missed are listed below with answers and explanations.  Look over the explanation for each problem so you can understand why you missed it!

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If you give a circle the vertical line test, there are only 2 points at which it will pass the test. In between those 2 points it fails every time. Therefore a circle is not a function.

In standard form, the equation of a circle is set equal to a constant. This constant is defined as being the square of the radius. So if you take the root of that number, you will get the length of the radius.

If solving systems of equations with a circle, they are fairly simple to solve by graphing. The other graph will cross the edge of the circle in several places usually. All you have to do is graph and then find the intersection points.

A hyperbola usually looks like 2 different equations that are facing away from each other. When you look at the graph it is in 2 parts.

An ellipse is a circle with a changing radius, every point you go to the radius is different. This creats a sort of streched circle effect.