GED Math Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

If you multiply the diameter of a circle by pi (π), what do you get?

Area

Circumference

Multiplying the diameter of a circle by pi (π) gives you the circumference of the circle. The formula for circumference is expressed as \( C = \pi \times d \), where \( d \) is the diameter. This formula reflects how the circumference is directly related to the diameter, making it possible to calculate the length around the circle using just the diameter and the constant π.

The other choices represent different properties of a circle or three-dimensional shapes: the area relates to the size of the circle's surface, the radius is half of the diameter, and volume pertains to three-dimensional figures, none of which can be calculated directly from the diameter in the manner described in this question.

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Radius

Volume

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