Geometry

Question Analysis

This question requires classifying an angle based on its measure. The main focus is differentiating between various angle types according to their degree values.

Key Concept Explanation

Acute angle: An angle with a measure less than 90°.

Right angle: An angle that measures exactly 90°, often marked by a small square at the vertex.

Obtuse angle: An angle with a measure greater than 90° but less than 180°.

Straight angle: An angle that measures exactly 180°, forming a straight - like appearance.

Step - by - Step Solution

1. Notice that the given angle has a measure of 180°.

2. Compare this measure to the definitions of different angle types. Since it is 180°, it matches the definition of a straight angle.

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