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because cicle sounds weird. r is used as an abbreviation for radius meaning half the diameter of the circle.
The diameter of a circle is the length of the circle from one side to the other, going through the middle of the circle. The radius is the measurement of length from the middle of the circle to the perimeter of the circle. This is half of the diameter.
Halfway across a circle
A curved shape does not have any straight lines. In a circle the line curves continually, meaning that the circle is a curved shape.
The distance around the whole circle. The equation is piD or 2pir