Miscellaneous Math

Drywall board installation: Approximate quantities needed for each item per 1,000' of wall to cover.

32 pcs. 4 x 8 panels or 25 pcs. 4 x 10 or 21 pcs. 4 x 12.
138 pounds of ready mix compound.
370 lineal feet of tape.
2,000 nails or 1,275 screws.
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How to determine the handing of an interior passage or closet door.

Face the door on the side of the door where in order to pen the door you must pull it toward you.  If the door knob is on the right it is a right hand operating door.  If the door knob is on the left it is a left hand operating door.

Exterior doors are identified in the same way, but it is also necessary to state that the door is an inswing (swings into the building) or an outswing (swings to the outside of the building).

The active door of a Double door will also need to be identified -usually this is done by viewing the door from the outside.  It is either a left active or right active panel.

It is also wise to check with the manufacturer or sales person before ordering to make sure that they do it the same way.
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Miscellaneous Math:

1.  Doubling a fraction makes it 1/2 its size.
For example:  2 x 1/16" = 1/32" and 2 x 1/4" = 1/8".

To calculate the angles of multisided objects:

Divide 360 by the number of sides and ÷ by 2.
For example:  An octagon -divide 360 by 8 (the number of sides) = 45 (the center angle) ÷ by 2 = 22-1/2 (the other 2 angles).