Q: What is the perimiter of a semi circle if the radius is 18cm?

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The radius is 5.00 cm.

A part of a circle is called an arc. The defined values for a circle are: radius, diameter, chord, area, circumference, and the arcs. There is the circumfrence, semi circle, arc, diameter,chord,segment,radius,quaderent

The length (circumference) of the curved part of a semi-circle is pi times the radius (pi*R). If the diameter is given, then the semi-circle length is 1/2 (pi * x D) because the radius is 1/2 of the diameter.(There are 2pi radians in a full circle.)A closed shape formed from a semi-circle has a perimeter P = D + (pi * D / 2)(diameter plus the curved part)

It is 1/2*pi*r2 = 190.1 cm2

The area of a full circle is pi x R squared where R = RADIUS The area of a semi circle is half of that, or pi x R squared/2

Related questions

It is the same as the radius of the whole circle.

It is half of a circle; the circle's radius (and that of the semicircle) is 10 cm.

The radius of a semi-circle is the same as the radius of the circle that was cut in half. The radius of a circle is the distance from the center of the circle to any point on the circle. That's the same as 1/2 of the diameter. It's easy to measure it on a semi-circle, because you don't even need to determine where the center is. The diameter is just the length of the flat side, and the radius is half of that.

about its radius

The radius is 5.00 cm.

Just the one and it is its radius when at right angles to the semi-circle's centre

32

It's half of the area of the whole circle...

Well the circumference equation is 2pi r and a semi-circle is half of a full circle so the circumference is 15.71 inches.

find the circumferance as if it was a whole circle but when you get the answer divide it by 2

count the number of sides?

The answer depends on the track. They are not all the same shape.