POCKET REFERENCE GUIDE — 19
Finding ArcSin, ArcCos, ArcTan
Find angle A if Sin A=0.57544, Cos
A=0.06753 and Tan A=0.87421; 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 Ç ç
86.12787°
(86°)
• 8 7 4 2 1 Ç 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 trian-
gle, if Side b (“y”) is 6-1/2” and Side c
(“r”), the hypotenuse, is 12-1/16”:
Note: Use the calculator’s x, y and r keys; sub-
stitute triangle legs a, b and c for
R
,
r
and
d
.
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
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