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Stage 4 - Stage 5

How many points lie on the graph of $x^2+y^2=0$`x`2+`y`2=0?

Easy

Less than a minute

How many points lie on the graph of $x^2+y^2=-81$`x`2+`y`2=−81?

State the equation of the circle.

A circle has its centre at the origin and a radius of $4$4 units.

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