Geometry

Question Analysis

This question is about identifying the type of an angle shown in a diagram.

Key Concept Explanation

Acute angles are less than 90°.

Right angles are exactly 90°, often indicated by a small square at the vertex.

Obtuse angles are greater than 90° but less than 180°.

Straight angles are 180°.

Step - by - Step Solution

1. Observe the given angle. There is a small square at the vertex of the angle.

2. Based on the key concept, an angle marked with a small square is a right angle. So, this is a right angle.

Common Mistakes

Mistaking the small square for a decoration and misclassifying the angle as acute or obtuse.