45-degree angle (45° angle)

45-degree angle

What kind of angle is a 45-degree angle? What does a 45-degree angle look like? Here we will explain how to determine what kind of angle a 45-degree angle is, and also illustrate what a 45-degree angle looks like. Let's start by defining the six types of angles:

Acute: < 90°
Right: = 90°
Obtuse: > 90° & < 180°
Straight: = 180°
Reflex: > 180°
Complete: = 360°

45° is less than 90°. Therefore, a 45-degree angle is an acute angle.

To illustrate what a 45-degree angle (45° acute angle) looks like, we drew the image below.

To create a 45-degree angle, we started at the horizontal line, which is called the initial side, and then turned 45° counter-clockwise towards the terminal side. Note that we shaded the 45-degree angle region in blue, and the two sides are connected at what we call the vertex.

Angle Maker
Use the tool below to see what another angle in degrees looks like.

45.1-degree angle
Do you want to see another illustration? Here is the next angle we have drawn for you.