A unit used to measure distances around a circle.

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Multiple Choice

A unit used to measure distances around a circle.

Explanation:
Degrees are the unit used to measure angles around a circle. A full turn around a circle is 360 degrees, so any angle or arc you talk about on a circle is described in degrees. The other words aren’t units for measuring around a circle: “whole” means the entire amount, “intersect” means lines crossing, and “vertex” is a corner point. So degree fits as the measurement used for circle-related angles. For example, a 90-degree angle creates a quarter of the circle, and 180 degrees makes a straight line through the center.

Degrees are the unit used to measure angles around a circle. A full turn around a circle is 360 degrees, so any angle or arc you talk about on a circle is described in degrees. The other words aren’t units for measuring around a circle: “whole” means the entire amount, “intersect” means lines crossing, and “vertex” is a corner point. So degree fits as the measurement used for circle-related angles. For example, a 90-degree angle creates a quarter of the circle, and 180 degrees makes a straight line through the center.

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