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5. A circle with centre (0,0) has equation: x2 + y2 = radius2 With: x2 + y2 = 25 = 52 The radius is 5.
Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..
I think you have missed out an equals sign. If you mean x2 + y2 = 16, then the radius is 4.
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