Question: A computer screen saver is an expanding circular pattern. The circle starts as a dot, then expands outwards as it grows over time. With a

A computer screen saver is an expanding circular pattern. The circle starts as a dot, then expands outwards as it grows over time. With a 21" screen, you have a viewing area with a 10" radius (measured from the centre of the screen to the corner). The screen reaches the corners in exactly 4 seconds. Express the area of the circle as a function of time.

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