User guide
Bolt Circle
Find the distance (in inches) between 6
bolts on a circle, if the radius is 5 inchs
(diameter 10 inches).
Steps Keystrokes  Display
Clear calculator  [On/C] [On/C] 0.
Enter diameter  10 [Inch] [Circ]
DIA
10 
INCH
Find circumference
[Circ] [Circ]
CIRC
31-7/16 
INCH
Divide by number of bolts
[÷] 6 [=]  5-1/4 
INCH
Scale Modeling
You have a 1/24th scale model car and
you’d like to add a model person to 
the layout next to the car. What is the cor-
rect scale size you should use, to be in
proportion to an actual man 6 feet 1-1/2
inches tall?
Steps Keystrokes  Display
Clear calculator  [On/C] [On/C] 0.
Find scale ratio 1 [÷] 24 [=] 0.041667
Multiply by  [x] 6 [Feet] 
actual height 1 [Inch] 1 [/] 2 [=]
0 
FEET
3-1/16 
INCH
Convert to decimal inch
to find scale size [Inch] [Inch] 3.0625 
INCH
Clear calculator [Conv] [x] 0.
38 – Measure Master Classic
™
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