# How to Figure Out a 45-Degree Angle

If you need to figure out a 45-degree angle and you don't have a protractor handy, you can create a workaround. A 45-degree angle is half the size of right angle, which is 90 degrees. Working with a ruler and a square or other right angle substitute, you can make the angle without any special tools. The 45-degree angle can be useful for projects like painting diagonals on walls, marking trim, or completing crafts and decoration projects. You may want to use the first 45-degree angle you make as a template so that you can use it to mark other angles easily.

## Step 1

Mark a piece of paper (or whatever surface you are working on) with a right angle. Use the square or whatever substitute right angle you have to trace the angle. The back of a pad of paper or even a magazine will suffice.

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## Step 2

Measure off a distance (the length is unimportant) from the point of the angle, and mark it on one leg of the angle.

## Step 3

Measure and mark the identical distance on the other leg.

## Step 4

Draw a diagonal line between the two points on the legs of the right angle.

## Step 5

Measure the length of the diagonal line and make a mark at its center point. Divide the total distance by two to ascertain this measurement.