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Question 1 of 6
1
of 6
Select the general form of the equation of a circle centred at the origin.
Select one answer
x
2
+
y
2
=
r
x
2
+
y
2
=
r
2
x
+
y
=
r
x
2
−
y
2
=
r
x
2
−
y
2
=
r
2
What is Pythagoras' theorem?
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