Which of the following lists are standard types of angles?

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Multiple Choice

Which of the following lists are standard types of angles?

Angles are categorized by their size in degrees. The standard types are acute, right, obtuse, and straight. An acute angle measures less than 90 degrees, a right angle is exactly 90 degrees, an obtuse angle is greater than 90 but less than 180 degrees, and a straight angle measures 180 degrees, forming a straight line. These four categories cover the basic single-angle measures that occur most often in geometry. The other lists mix different concepts: some describe relationships between angles (like how some pairs add to 90 or 180, or how vertical angles relate) or refer to circle properties (area, circumference, radius, diameter) or to basic geometric objects (point, line, segment, ray). None of those are standard single-angle size types.

Angles are categorized by their size in degrees. The standard types are acute, right, obtuse, and straight. An acute angle measures less than 90 degrees, a right angle is exactly 90 degrees, an obtuse angle is greater than 90 but less than 180 degrees, and a straight angle measures 180 degrees, forming a straight line. These four categories cover the basic single-angle measures that occur most often in geometry.

The other lists mix different concepts: some describe relationships between angles (like how some pairs add to 90 or 180, or how vertical angles relate) or refer to circle properties (area, circumference, radius, diameter) or to basic geometric objects (point, line, segment, ray). None of those are standard single-angle size types.

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