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Parts of the circle 1
for 6th grade

Identify parts of a circle: radius, diameter, circumference; calculate radius, diameter

Identify parts of the circle: diameter, radius, circumference

Diameter

The diameter of a circle is its maximum width which is always a line that passes through the center of the circle.

Radius

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.

Circumference

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).

1 / 7
Part P of the circle is called the diameter
the diameter
2 / 7
Part P of the circle is called the radius
the radius
3 / 7
Part P of the circle is called the circumference
the circumference
4 / 7
The part of this circle that is 7 cm long is called the radius
the radius
5 / 7
The part of this circle that is 6 cm long is called the diameter
the diameter
6 / 7
The part of this circle that is 25 cm long is called the circumference
the circumference
7 / 7
Part M of the circle is called the diameter
the diameter

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Each of our math topics for secondary are made up of between 6 and 20 question and answer pairs (both the written form and a robot voice speaking those questions and answers). Each topic can be used with all the activities on the site.


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