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Q: Define radius of a circle

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A point. To learn why and more about circles go to this website: windowseat.ca/circles

pi is the ratio between the radius and the circumference of the circle if the radius is 1 the circumference is pi

Yes

True

// macro definitions: #define PI 3.14159265358979323846 #define CIRCUMFERENCE(radius) (2. * (radius) * PI) // use this as in CIRCUMFERENCE(21.34)

Both the radius and the diameter are measurements which define a circle. The diameter is the distance straight across a circle from one edge to the other, passing through the midpoint of the circle. The radius is half of the diameter. Therefore, it is incorrect to say that either comes before the other.

the radius of a circle is r

The radius of a circle is half the circle's diameter

Radius of a circle= Perimeter of the circle/2*pi Radius is half the diameter Radius is the length of a straight line from the center point of the circle to the edge of the circle.

The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.

The radius of a circle = the diameter of the circle divided by 2

Diameter of circle = 2 * Radius of the circle.

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