Calculated Industries 4090 User Manual
Page 42
U
SER
’
S
G
UIDE
— 41
Finding Sine, Cosine, Tangent
Find Sine 12°, Cosine 33° and Tangent 75°:
KEYSTROKE
DISPLAY
o o
0.
1 2 S
0.207912
3 3 ç
0.838671
7 5 t
3.732051
Finding “Angle A” (ArcSin, ArcCos, ArcTan)
Find Angle A if Sine A = 0.57544, Cosine A = 0.06753 and Tangent
A = 0.87421 and round to the nearest whole angle:
KEYSTROKE
DISPLAY
o o
0.
• 5 7 5 4 4 Ç S
35.13045° (35°)
• 0 6 7 5 3 З з
86.12787° (86°)
• 8 7 4 2 1 З t
41.16028° (41°)
Using Trigonometry to Find Unknown Side
Using the Pythagorean Theorem (a
2
+ b
2
= c
2
) keys, find Side a (“x”)
of a Right Triangle, if Side b (“y”) is 6-1/2 Inches and Side c (“r”), the
Hypotenuse, is 12-1/16 Inches.
Note: Use the calculator’s
R, r and d keys; substitute triangle legs a, b and c for
[x], [y] and [r].
KEYSTROKE
DISPLAY
o o
0.
6 i 1 / 2 r
Y 6-1/2
INCH
1 2 i 1 / 1 6 d
R 12-1/16
INCH
R
X 10-3/16
INCH