Calculated Industries 4090 - Manual (Page 42)

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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