Identify parts of a circle: radius, diameter, circumference; calculate radius, diameter
Home / 6th grade / Geometry & measures / Circle / Parts of the circle 1
The diameter of a circle is its maximum width which is always a line that passes through the center of the circle.
The radius of a circle is the distance from the center of the circle to the edge. The radius is always exactly half the length of the diameter.
The circumference of a circle is the length of it's perimeter. It has been known since the time of the ancient greeks that the circumference of a circle can be calculated if you know it's diameter or radius, and the value of π (pi).
To calculate the circumference from a given diameter, use the formula:
C = πd (where d is the diameter).
To calculate the circumference from a given radius, use the formula:
C = 2πr (where r is the radius).
Below is a table showing the first 7 question answer pairs for the topic "Parts of the circle 1" as used in the lessons for this topic. Our games and tests for the topic use these 7 items plus 9 additional question answer pairs.
The topic "Parts of the circle 1" is in the category Geometry & measures for 6th grade (ages 11 to 12).
Home / 6th grade / Geometry & measures / Circle / Parts of the circle 1
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