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A semicircle is half a circle. So the perimeter of a semicircle is half the circumference of the whole circle plus the diameter, which is twice the radius:

perimeter = 1/2 x 2{pi}r + 2r

perimeter ~= 3.14x8 + 2x8 ~= 41.13cm

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Q: What is the perimeter of a semicircle with radius 8cm?
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Related questions

What is the perimeter of a 8cm semicircle?

8*pi + 16 = 41.13 cm (approx)It depends on whether 8 cm is the radius or diameter of the semicircle.


How do you find the perimeter of a shape that has a semicircle?

To find the perimeter of the curved section of the semi-circle: Perimeter of semicircle = Pi x radius If you also need to the find the perimeter of the straight part of the semicircle (the diameter), it is simply double the radius.


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What is the perimeter of a semicircle if the diameter is 8cm?

To find the perimeter of a semicircle, you need to add the curved edge (half the circumference of a full circle) to the diameter of the semicircle. The formula for the circumference of a full circle is C = πd, where d is the diameter. Therefore, the circumference of the full circle is π(8) = 8π cm. The perimeter of the semicircle would be half of the circumference of the full circle plus the diameter, so it would be 4π + 8 cm, or approximately 20.28 cm.


What is the perimeter of a semicircle that is 5 inches?

The answer will depend on what measure of the semicircle is 5 inches: its radius or diameter.


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Calculating the radius of a semicircle depends on what information about the semicircle is given.


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What is a semicircle?

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If the base of a semicircle is a feet What is its perimeter?

The circumference of a circle = 2π r = π a (where a is the base of the semicircle and is also the diameter of the circle) The perimeter of the semicircle = half the perimeter of the circle + the base length The perimeter of the semicircle = πa/2 + a = a(1 + π /2) feet


How do you find the diameter of a semicircle when radius is given?

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