If the radius of the circle is known, the diameter formula is diameter=2R, where R equals the circle's radius. If the circumference of the circle is known, the diameter is found using diameter=C/Pi, where C is the circumference and pi is approximately 3.142.
Know MoreIf the area of a circle is known, the diameter is the square root of 4A/Pi, where A is the area of the circle and Pi is approximately 3.142. The diameter of the circle is the length of the line through the center of the circle that touches two of the points on its edge The center of the circle is the midpoint of the diameter. A diameter may also be referred to as a chord, which is any line that joins two points on a circle. The diameter is the longest chord on any circle.
Learn more about GeometryA circle with a diameter of 8 inches has a radius of 4 inches. To find the radius of a circle based on a given diameter, divide the diameter by 2. Consequently, to find the diameter, multiply the radius by 2.
Full Answer >The diameter of a circle is the length of a straight line going from one side of a circle to the opposite side. To measure the diameter, simply choose two points on the edge of a circle that are directly across from each other, and measure the distance between these points. You will need a measuring device to perform this task.
Full Answer >Some other shapes besides circles that also can have radii are regular polygons like a pentagon or hexagon. The definition of the radius for a regular polygon is that it is the distance from the center point of the polygon to one of its vertices. Regular polygons are figures that have side lengths that are all congruent.
Full Answer >The mathematical constant pi has many uses, most of which are associated with the circle or circular objects. Often, pi is used for geometric purposes, such as calculating the area of a circle or the volume of a sphere.
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