Calculated Industries 4090 - Manual (Page 75)

74 — ITI S
HEET
M
ETAL
/HVAC P
RO
5) Input Triangle II and find Angle A1 and the “Angle Between”:
KEYSTROKE DISPLAY
1. Enter side a2, b2, and recall c (“a2” was calculated as “y” in first
section; “c” is already stored):
o 0.
8 f 7 i 5 / 8 Ç 4 A 8
FEET
7-5/8
INCH
2 f Ç 5 B 2
FEET
0
INCH
® 6 C 9
FEET
8-1/8
INCH
2. Use Law of Cosines to find Angle “A2” and store in Memory 3:
Ç 9 /_ A 53.40618°
= Ç 3 M-3 53.40618°
3. Recall M1, M2, and M3 and find total:
® 1 + ® 2 + ® 3 = 135.9458°
4. Add total to M+ (regular Memory):
μ M+ 135.9458°
5. Subtract above angle from known angle of 180° to find the Angle
Between objects (AB):
1 8 0 – ® μ = 44.05425
6. Convert to degrees:minutes:seconds:
Ç • DMS 44.03.15
7. Clear Memory and clear display:
® ® o 0.
M
M
M
STORED
STORED
STORED