Question

1. choose the best answer. which angle is a right angle?

○ ∠1
○ ∠3
○ ∠4
○ ∠2

Explanation:

Step1: Recall the definition of a right angle

A right angle is an angle that measures \( 90^\circ \).

Step2: Analyze each angle

• For \( \angle 1 \): From the diagram, we can see the related angles around it, and it is not marked as \( 90^\circ \), so it is not a right angle.
• For \( \angle 3 \): The diagram shows a square corner (a symbol for a right angle) and is labeled with \( 90^\circ \), so it measures \( 90^\circ \), which is a right angle.
• For \( \angle 4 \): It is labeled with \( 150^\circ \), so it is not a right angle.
• For \( \angle 2 \): It is part of the angles around the vertex with \( 30^\circ \) and other angles, and it does not measure \( 90^\circ \).

Answer:

\(\boldsymbol{\angle 3}\) (or in the option format: B. \(\angle 3\) assuming the options are ordered as given with \(\angle 3\) as the second option)