diameter of semicircle formula
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P = ½(2πr) + 2r. P = πr + 2r.
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Step-by-step explanation:
Since the semicircle includes a straight side, its diameter, we cannot describe the distance around the shape as a circumference; it is a perimeter. Using the substitution property of equality, you can also replace diameter with radius throughout: P = ½(2πr) + 2r. P = πr + 2r.
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