Use a protractor to measure the size of the angles in each of the diagrams below.

As an AI, I cannot physically use a protractor to measure the angles. However, I can estimate the angles based on the visual representation. For precise measurements, you would need to use a physical protractor.

Here are the estimated angles:

The angle appears to be an obtuse angle.

$$\text{Angle: } \boxed{\text{approximately } 135^\circ}$$

The square symbol indicates a right angle.

$$\text{Angle: } \boxed{90^\circ}$$

The angle appears to be an acute angle.

$$\text{Angle: } \boxed{\text{approximately } 35^\circ}$$

The angle appears to be an obtuse angle.

$$\text{Angle: } \boxed{\text{approximately } 115^\circ}$$