The extremity of the large hand of the clock moves approximately 88 cm in 20 minutes. This is calculated based on the circumference of the circle the hand traces and the fraction of that circle traveled in the given time. Therefore, the correct choice is (a) 88 cm.
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To determine how much distance the extremity of the large hand of a clock moves in 20 minutes, we need to calculate the arc length that the hand traces in that time period. ;