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KEY INPUT & DISPLAY
0
RUN 9
Feet
2
Inch
1. Enter window width (chord length) and height as “rise” and “run”:
RISE 3
Feet
11-1/2
Inch
ARC 163.26˚
3. Calclate the angle of the window’s arc:
ARC 13
Feet
2-3/8
Inch
4. Calculate the length of the arc:
CORD 9
Feet
2
Inch
5. Display entered chord length (the width of the window):
SEG 27.48605
SQ Feet
6. Calculate the area of the window segment:
PIE 30.57678
SQ Feet
7. Calculator will next display pie slice area. This is not relevant to a window.
RISE 3
Feet
11-1/2
Inch
8. Display the entered height of the middle of the window:
OC 16
Inch
9. Display On-center spacing:
ARCHED SEGMENT WALLS (OUTSIDE)
Example: A lobby is designed to have an arched window set behind the reception desk with
measurements of 9 Feet 2 Inches in width and and a window height of 3 Feet 11-1/2 Inches. Find the
arc angle, arc length and segment area of the window (similar to regular arc calculation). Then, using
standard On-center spacing of 16 Inches, nd the “outside” arched segment wall lengths in order to
frame the window.
Arched Segment Walls
The outside arched wall lengths are measured outside of the arc (see diagram below).
The inside arched wall lengths are measured inside of the arc.
Remember to press to clear entries in between problems.
On/C On/C
AW 1 0
Feet
2-3/8
Inch
10. Calculate the arched segment wall lengths:
AW 2 0
Feet
10-1/8
Inch
AW 3 2
Feet
3-9/16
Inch
STORED
The width of a window = chord length for arch calculations
On/C On/C
Feet Inch
Run
9
2
Rise
Feet Inch
1 23
/
11
Arc
Arc
Arc
Arc
Arc
Arc
Arc
Arc
Arc
Arc
3’ 11-1/2”
9’ 2”
“Inside”
“Outside”
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