Texas Instruments TI-34 User Manual - Page 26

Example Radian mode

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Tan-1 Cos %B 6 1 E < 5 V %B 2 60 E < Example Radian mode Tan q " < - %B 3 g P 4 " E < Tan-1 %B 6 1 E < r Cos 5 V %B 2 g P 4 " E < 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 A = 7-3 therefore m±A = tan-1 ⎛ ⎝ 7-3 ⎞ ⎠ m±A + m±B + 90Ä = 180Ä A therefore m±B = 90Ä - m±A 3 c c = 32 + 72 C 7 B 26

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26
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
-1
%B
6
1
E <
Cos
5
V
%B
2
60
E <
Tan
q " < -
%B
3
g P
4
" E
<
Tan
-1
%B
6
1
E <
r
Cos
5
V
%B
2
g P
4
" E <
tan A =
therefore
m
±
A = tan
-1
m
±
A +
m
±
B + 90
Ä
= 180
Ä
therefore m
±
B = 90
Ä
-
m
±
A
c =
7
3
--
7
3
--
⎠
⎞
⎝
⎛
3
2
7
2
+
c
B
A
3
7
C