Character mistake: Math Club Advisor Charlie should know that the formula for solving the circumference is "C = 2πr" or "C = π x diameter." However, he used "P" (Perimeter) instead of "C" on the blackboard. "Perimeter" does mean the distance around a shape, but the word "circumference" is used for the perimeter of a circle. The formula for the perimeter of a rectangle is different ["P = (L + W) × 2"] and more basic than the formula for a circle, so the "advanced" students should be given the correct term. (00:04:40)
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