How do you make a sloped window sill?

Quote from the video:
Quote from Youtube video: Simple little thing they sloped the sill the way this is framed they take this piece of wood and sloped. It that's called craftsmanship. It's building science and craftsmanship.

How do you measure the angle of a window sill?

Step 1. Place a carpenters square against the side blind stop,with its base resting on the sill (figure 5). Step 2. Measure the distance (rise) at point A, of the sill from the two inch mark.



Finding Your Sill Angle.

Rise at A Angle
1/8″
1/4″
3/8″ 11°
1/2″ 14°