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42 — S
HEET METAL/HVAC PRO CALC
Using Trigonometry to Find Unknown Angle or Side
Example 1 — Cos A:
Solve for the unknown angle A if the two known sides are:
Side b = 15 mm
Side c = 35 mm
a) Longhand Method
: In this case, use the trigonometry formula:
Cos = Adjacent/Hypotenuse or cos A = b/c
KEYSTROKE DISPLAY
o o 0.
1 5* ÷ 3 5 = Ç ç 64.62307°
(64.6°)
Ç • DMS 64.37.23
*Note: you do not have to label mm.
b) Alternative Method (Use Pythagorean Theorem Keys):
Insert values into x, y, or r keys to solve for Theta.
KEYSTROKE DISPLAY
o o 0.
1 5 R X 15.
3 5 d R 35.
p 64.62307°
(64.6°)
Ç • DMS 64.37.23
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