Classify the angles whose magnitudes are given below.

$45°$

The angles are classified under the following types:

• Acute Angle – An angle whose measure is less than $90°$
• Right Angle – an angle that is exactly at $90°$
• Obtuse Angle – an angle whose measure is greater than $90°$ and less than $180°$
• Straight Angle – an angle that is exactly at $180°$
• Reflex Angle – an angle whose measure is greater than $180°$and less than $360°$
• Full Angle – an angle whose measure is exactly$360°$

Since $45°<90°$

It is less than $90°$

Thus, it is an acute angle.

Hence,$45°$ is an acute angle.