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Question
Find the equation of the following circles having the centre (0,0) and radius 2 units
Solution
Equation of the circle when centre origin (0, 0) and radius r is x2 + y2 = r2
⇒ x2 + y2 = 22
⇒ x2 + y2 = 4
⇒ x2 + y2 – 4 = 0
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