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Number of Board Feet Based on Entered Volume ....................38

CIRCLE AND ARC CALCULATIONS............................................39

Circumference and Area of a Circle...........................................39
Arc Length – 

Degree and Diameter Known

...............................39

Arc Length – 

Chord Length and Segment Rise Known

.............39

Arc Calculations – 

Arc Length and Diameter Known

................40

ARCHED SEGMENT WALLS .......................................................41

Arched Segment Walls – 

Arched Windows (No Base)

..............41

Arched Segment Walls – 

Arched Windows (With Base)

...........42

Arched Segment Walls – 

Chord Length and Segment Height 

Known

.....................................................................................43

COMPOUND MITER.....................................................................45

Compound Miter Cuts ................................................................45

CONCRETE/PAVING ....................................................................46

Volume of Concrete for a Driveway ...........................................46
Concrete Columns .....................................................................47
Complex Concrete Volume ........................................................48
Polygon, Finding Angles Based on Entered Radius and 

Number of Sides .....................................................................49

Concrete Footings (

NOT AVAILABLE ON TRIG MODEL

#4080) ...........50

Squaring-up a Foundation .........................................................51

DRYWALL (

NOT AVAILABLE ON TRIG MODEL

#4080)...........................52

Number of Drywall Sheets for a Given Area..............................52
Number of Drywall Sheets for a Given Length ..........................52

GRADE/SLOPE.............................................................................53

Back-Fill on a Slope – 

Percent of Grade Known

.......................53

RIGHT TRIANGLE AND ROOF FRAMING EXAMPLES ..............54

Roof Framing Definitions ...........................................................55
Degree of Pitch ..........................................................................57
Percent Grade............................................................................57
Pitch Ratio or Slope ...................................................................57
Common Rafter Length..............................................................58
Common Rafter Length – 

Pitch Unknown

.................................58

Angle and Diagonal (Hypotenuse) .............................................59
Rise ............................................................................................59
Rise and Diagonal......................................................................59
Sheathing Cut ............................................................................60
Regular Hip/Valley and Jack Rafters  ........................................60
Jack Rafters – 

Using Other Than 16-Inch On-Center 

Spacing

..................................................................................61