Operation Manual

Copyright © 2006 Texas Instruments Incorporated 22
Example Radian Mode
³ Problem
Find angle A of the right triangle below. Then calculate angle
B and the length of the hypotenuse c. Lengths are in meters.
Round results to one decimal place.
Reminder:
Tan p"<- @
gq4 "E <
Tan
-1
%\1 E<
n
Cos 5 V?gq4 "E
<
n
tan A = therefore m
±A = tan
-1
m
±A + m±B + 90Ä = 180Ä
therefore m
±B = 90Ä - m±A
c =
p$$""<
7
3
--
7
3
--
⎠
⎞
⎝
⎛
3
2
7
2
+
c
B
A
3
7
C