Geometry

Question Analysis

This question is about identifying the correct measurement for a right angle among given options. The main focus is on understanding the definition of a right angle and distinguishing it from other angle measurements.

 

Key Concept Explanation

A right angle is defined as an angle that measures exactly 90°. Acute angles measure less than 90°, obtuse angles measure greater than 90° but less than 180°, and a straight angle measures 180°.

 

Step - by - Step Solution

1. Examine each option one by one and compare it with the definition of a right angle.

2. Determine which option matches the 90° measurement.

 

Option Analysis

45°: This is less than 90°, so it is an acute angle, not a right angle.

90°: This matches the definition of a right angle, so it is the correct answer.

135°: Since it is greater than 90° but less than 180°, it is an obtuse angle, not a right angle.

180°: This is the m...