Question

estimate the measure of this angle within 15°.
image of a right angle (two perpendicular line segments, one vertical upward, one horizontal rightward)
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measure angles on a circle
lesson: measuring angles with a protractor

Explanation:

Step1: Identify the angle type

The angle has two perpendicular rays (one vertical, one horizontal), forming a right angle.

Step2: Recall right angle measure

A right angle is $90^\circ$, and $90^\circ$ is within $15^\circ$ of itself (error margin allows).

Answer:

$90$