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(Cont'd)
KEYSTROKE
1. Enter side a, b and c:
3 5 f 8 i 3 / 4 Ç 4 A
o o
2 1 f 8 i 1 5 / 1 6 Ç 5
2 4 f 3 i 7 / 8 Ç 6 C
2. Calculate and input Theta by subtracting Angle "A" (found by the
Law of Cosines) from known angle of 180°:
1 8 0 – Ç 9
=
p
3. Recall stored "c" and input as "r" the Hypotenuse:
® 6 = d
4. Calculate "x":
R
5. Calculate "y":
r
Sheet Metal Panels for an Irregular Hip Roof
A contractor is going to cover one end of an Irregular Hip Roof with
sheet metal panels. The length of the roof along the eave is 98 Feet
5-1/4 Inches, the length along the left hip is 38 Feet 10-11/16
Inches, and the length along the right hip is 73 Feet 1-1/8 Inches.
Find the angles between the roof edges.
KEYSTROKE
1. Enter lengths:
9 8 f 5 i 1 / 4 Ç 4 A
3 8 f 1 0 i 1 1 / 1 6 Ç 5
7 3 f 1 i 1 / 8 Ç 6 C
2. Calculate the angles between the roof edges:
Ç 9
9
9
9
35
STORED
B
21
FEET
STORED
24
STORED
78.43128 (Theta θ)
R 24
X 4
FEET
Y 23
FEET
98
STORED
B
38
FEET
STORED
73
STORED
AREA 1232.046
U
SER
DISPLAY
0.
8-3/4
FEET
INCH
8-15/16
INCH
3-7/8
FEET
INCH
/ _ A 101.5687°
/ _ Ø 78.43128°
3-7/8
FEET
INCH
10-9/16
INCH
9-15/16
INCH
DISPLAY
5-1/4
FEET
INCH
10-11/16
INCH
1-1/8
FEET
INCH
/ _ A 119.9081°
/ _ B 20.02713°
/ _ C 40.06473°
SQ FEET
'
G
— 59
S
UIDE
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