U
SER
’
S
G
UIDE
— 59
(Cont’d)
KEYSTROKE
DISPLAY
1. Enter side a, b and c:
o o
0.
3 5 f 8 i 3 / 4 Ç 4
A
35
FEET
8-3/4
INCH
2 1 f 8 i 1 5 / 1 6 Ç 5
B
21
FEET
8-15/16
INCH
2 4 f 3 i 7 / 8 Ç 6
C
24
FEET
3-7/8
INCH
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
/
_A 101.5687°
=
78.43128
(Theta
θ
)
p
/
_Ø 78.43128°
3. Recall stored “c” and input as “r” the Hypotenuse:
® 6 = d
R 24
FEET
3-7/8
INCH
4. Calculate “x”:
R
X 4
FEET
10-9/16
INCH
5. Calculate “y”:
r
Y 23
FEET
9-15/16
INCH
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
DISPLAY
1. Enter lengths:
9 8 f 5 i 1 / 4 Ç 4
A
98
FEET
5-1/4
INCH
3 8 f 1 0 i 1 1 / 1 6 Ç 5
B
38
FEET
10-11/16
INCH
7 3 f 1 i 1 / 8 Ç 6
C
73
FEET
1-1/8
INCH
2. Calculate the angles between the roof edges:
Ç 9
/
_A 119.9081°
9
/
_B 20.02713°
9
/
_C 40.06473°
9
AREA 1232.046
SQ FEET
STORED
STORED
STORED
STORED
STORED
STORED