CIRCUMFERENCE OF SEMI CIRCLE ( without diameter)
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Step-by-step explanation: Circumference of semicircle of radius r is πr.
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The perimeter of a circle is π × d where d is the diameter so half of that is 1/2 π × d. But If you are going to walk around a semicircle you need to go half way around the circle and then across a diagonal to get back to where you started so the perimeter is 1/2 π × d + d.
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