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प्रश्न
Find the centre and radius of the circle:
x2 + y2 = 25
उत्तर
Comparing the equation x2 + y2 = 25 with
x2 + y2 = a2, we get,
a2 = 25
∴ a = 5
∴ centre is (0, 0)
and radius = a = 5
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