GED Math Practice Test

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What does the "d" represent in the circumference formula c = πd?

Area
Height
Diameter
Radius

The correct answer is: Diameter

The "d" in the circumference formula $ c = \pi d $ represents the diameter of a circle. This formula states that the circumference (the distance around the edge of the circle) is equal to pi multiplied by the diameter. The diameter is the straight line distance that passes through the center of the circle and touches two points on its boundary, making it a crucial aspect of understanding the relationship between a circle's dimensions. Knowing the diameter allows you to easily calculate the circumference using this simple and widely recognized formula.