Bay angles:

1. Formula for determining angle to cut: 180º minus measured bay angle, divide that number by two. (180º = straight wall) a. Example: 180º - 135º (measured angle in bay) = 45º ) 2 = 22½º (22½º is the angle cut)
    
   
    
2. OPTION 1: Measure angle of bay with a cardboard protractor from Kirsch.
3. OPTION 2: Place two index cards or business cards in the corner of the bay. Overlap the cards and staple them together. The outer edge represents the angle of the bay.