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The total perimeter is the diameter (twice the radius) plus half the circumference of the full circle. So it's 12 + (12π / 2) = 12 + 6π = 30.85 cm.
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The total perimeter is the diameter (twice the radius) plus half the circumference of the full circle. So it's 12 + (12π / 2) = 12 + 6π = 30.85 cm.