Question: 12. A pebble is dropped into a still pond, causing ripples in the form of concentric circles. The radius of the outer circle is increasing

12. A pebble is dropped into a still pond, causing ripples in the form of concentric circles. The radius of the outer circle is increasing at a rate of 25 cm. When the radius is 100 cm, at what rate is the is the total area of the disturbed water increasing

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