Interactive practice questions
How many points lie on the graph of $x^2+y^2=0$x2+y2=0?
Easy
< 1min
How many points lie on the graph of $x^2+y^2=-81$x2+y2=−81?
Easy
< 1min
State the equation of the circle.
Easy
1min
A circle has its centre at the origin and a radius of $4$4 units.
Easy
1min
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