How do I measure bow window dimensions?

Many people confuse bow window and bay window. A bay window is a set of 3 windows connected together at equal angles. A bow window can have several panels creating a more rounded effect. In order to measure a bow window, you need a tape measure, ladder, pen, paper and a calculator, unless you have a good head for numbers. First, write down the width of the glass panels. Second, measure the width of the window from 1 joint to the next, and note this down. Third, repeat the previous 2 steps, to measure the height of the window. Finally, add all 3 different measurements together, leaving you with 4 totals.