Mitered angles are a basic element carpentry used to join pieced of wood trim where two angles come together. The proper cut depends on calculating the angel correctly. A simple mathematical method will determine the miter cut needed for any angle.

...

Step 1

Place a bevel square against the two adjacent wall planes at the corner. Tighten the bevel square's locking screw to hold the setting.

Step 2

Align the base of a protractor with the edge of the bevel square's hand. Read the protractor's degree scale where the bevel square's blade crosses it to determine the angle.

Step 3

Define the miter cut angle by dividing the angle determined in Step 2 by two. Example: the miter cut angle for a 90-degree corner is two 45-degree angles. Use this basic formula to calculate the mitre cut for any corner or angled joint.