All GRE Subject Test: Math Resources
Example Questions
Example Question #61 : Gre Subject Test: Math
What is the equation of a circle with center at and a radius of
?
Step 1: Recall the general equation for a circle (if the vertex is not at :
, where center=
Step 2: Recall the shift of the graph..
If the value of is positive, it will be shown as a negative shift in the equation.
If the value of is negative, it will be shown as a positive shift in the equation.
If the value of is positive, it will be shown as a negative shift in the equation.
If the value of is negative, it will be shown as a positive shift in the equation.
Step 3: Look at the center given in the problem and find the rule(s) in step 2 that will apply:
Center=,
,
Step 4: Plug in into the equation of a circle:
Simplify:
Example Question #62 : Gre Subject Test: Math
What is the vertex of the equation of a circle:
Step 1: There are no numbers next to and
, so their is no movement of the vertex..
Step 2: Recall the vertex of a circle that does not move...
The vertex of this circle is .
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All GRE Subject Test: Math Resources
