Types of Angles

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Figure 1.

Here, we have an angle Angle. We can call it either angle CAB (or BAC), or angle 1.

Angles are measured using degrees, as shown below.

Figure 2.

Acute Angle
An Acute Angle is an angle between 0 and 90 degrees.

Figure 3.

Right Angle
A Right Angle is an angle that is exactly 90 degrees.

Figure 4.

Obtuse Angle
An Obtuse Angle is an angle between 90 and 180 degrees.

Figure 5.

Straight Angle
A Straight Angle is an angle that is exactly 180 degrees.

Figure 6.