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www.reference.com/math/determine-circumference-semicircle-e44c79f6976ca3d2

A semicircle can be seen as the shape that is formed when a circle is cut in half along its diameter. The arc that remains as a part of the semicircle is half as long as the circumference of the whole circle. The perimeter of the semicircle also includes the straight line that connects the two ends of that arc.

www.quora.com/How-do-you-calculate-the-circumference-of-a-semicircle-What-are...

Let me ask you a question: How do you calculate the circumference of a circle? As you know, the formula for the circumference of a circle is: C = π · d or C = 2 · π · r The circumference is equal to π times the length of the diameter, or it is equ...

sciencing.com/perimeter-semi-circle-4489560.html

Then work out 37.68 ÷ 2 = 18.84. You now have the perimeter of the curved edge of the semi circle. But a semi circle also has a straight edge, which is why you have to add the length of the diameter to calculate the whole perimeter. In this case, work out 18.84 + 12 = 30.84. The perimeter of your semi circle is 30.84 centimeters.

www.bbc.com/bitesize/guides/ztndmp3/revision/7

Perimeter and the area of a semicircle Perimeter of a semicircle. Remember that the perimeter is the distance round the outside. The perimeter of a semicircle is half of the circumference plus the ...

www.wikihow.com/Find-the-Area-of-a-Semicircle

This question uses the concept of circumference rather than area, so be sure to read about calculating the circumference of a circle. To find the radius from the perimeter, you need to know that the perimeter (also called "circumference" when talking about a full circle) of a full circle is given by 2*pi*r.

www.wikihow.com/Calculate-the-Circumference-of-a-Circle

To calculate the circumference of a circle, use the formula C = πd, where "C" is the circumference, "d" is the diameter, and π is 3.14. If you have the radius instead of the diameter, multiply it by 2 to get the diameter. You can also use the formula for circumference of a circle using radius, which is C = 2πr.

mathcentral.uregina.ca/QQ/database/QQ.09.07/h/lisa12.html

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. Penny

mathvillage.info/node/159

However, there will be a twist in what we do, because the formula gives us the circumference of a complete circle. You will solve this problem using three steps: find the circumference of a full circle with the same diameter, divide that circumference in half, and then add the diameter.

www.mathplanet.com/.../calculating-the-circumference-of-a-circle

The distance around a rectangle or a square is as you might remember called the perimeter. The distance around a circle on the other hand is called the circumference (c). A line that is drawn straight through the midpoint of a circle and that has its end points on the circle border is called the diameter (d)