Mathematics ACT Aspire Practice Test 2026 – Complete Study Resource

Question: 1 / 400

What is the definition of circumference?

The number of square units inside a circle

The distance around the circle

The definition of circumference is the distance around a circle. This term specifically refers to the perimeter or boundary length that encloses the entire circle. To understand this concept, consider that if you were to measure the distance all the way around a circle using a flexible measuring tape, that length would be the circumference.

The other options describe different geometric concepts. For instance, the number of square units inside a circle pertains to its area, while the area of a rectangle formed by any aspect of a circle does not apply to the definition of circumference. The diameter, which is the length of a line segment that passes through the center of the circle and connects two points on its boundary, is also a distinct concept from circumference. Thus, the correct understanding of circumference as the distance around the circle solidifies its unique identity in geometry.

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The area of the rectangle formed by a circle

The diameter of the circle

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