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74 — S
HEET METAL/HVAC PRO CALC
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
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