Geometry

Question Analysis

This question focuses on identifying a semicircle arc in a circle, testing the understanding of the definition and properties of semicircle arcs.

Key Concept Explanation

Semicircle Arc: An arc that represents half of the circumference of a circle. It is subtended by a diameter of the circle and has a measure of .

Step - by - Step Solution

1. Analyze each option based on the definition of a semicircle arc.

Check if the arc is formed by the two endpoints of a diameter.

2. For arc , since  passes through the center  of the circle, it is a diameter. The arc  thus represents half of the circle's circumference, making it a semicircle arc.

3. For arc

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