Using Trigonometry To Find Unknown Angle Or Side - Calculated Industries Sheet Metal/HVAC Pro Calc User Manual

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
o o
1 5* ÷ 3 5 = Ç ç
Ç •
*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
o o
1 5 R
3 5 d
p
Ç •
42 — S M
HEET ETAL
/HVAC P
RO
C
ALC
DISPLAY
0.
64.62307°
(64.6°)
DMS 64.37.23
DISPLAY
0.
X 15.
R 35.
64.62307°
(64.6°)
DMS 64.37.23