Question

which of the following is a right angle drawn in the figure below? ∠cda ∠fdh ∠ade ∠heb

Explanation:

Step1: Recall the definition of a right angle

A right angle is an angle of $90^\circ$, and in a diagram, it is often marked with a small square at the vertex.

Step2: Analyze each angle

• For $\angle CDA$: There is no right - angle mark at vertex $D$ for this angle, so it is not a right angle.
• For $\angle FDH$: There is no right - angle mark at vertex $D$ for this angle, so it is not a right angle.
• For $\angle ADE$: There is no right - angle mark at vertex $D$ for this angle, so it is not a right angle.
• For $\angle HEB$: At vertex $E$, there is a small square, which indicates that $\angle HEB = 90^\circ$, so it is a right angle.

Answer:

$\angle HEB$