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Radius is the distance from the center point to the edge of the circle. Diameter is the distance straight through the center point and across the circle. Circumference is the distance one full turn around the circle.
Radius = 1/2 of the diameter
Radius = (circumference) divided by (2 pi)
Diameter = 2 times the radius
Diameter = (circumference) divided by (pi)
Circumference = (pi) times the diameter
Circumference = (2 pi) times the radius
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How can you be sure if there is a relationship between diameter and the circumference?
You can do an experiment on several circles of different diameters.
Calculate the circumference of a circle with each diameter?
Multiply each of the diameters by pi (pi = 3.14159265 or 3.14 for rough approximation) to find the circumferences of the circles.
What are the special properties of circles?
They have a circumference which is 2*pi*radius or diameter*pi They have an area which is pi*radius2 They have sectors They have chords They have segments They have a total of 360 degrees around their circumferences They have arcs which is part of their circumferences They can have a tangent which is a straight line that touches it at one point
What is the relationship between the radius of a circle and the circumference?
any circles circumference divided by its diameter will equal pi, or 3.14159 approximately
What is the ratio between a circles diameter and its radius?
It is: 2 to 1
