Casio fx-350MS Booklet

CHAPTER 7 Solutions of Triangles
20
=
4
x
2
8
+
x
2
–
5
x
2
4
•
8
(
4
X
¡
2
X
=
SHIFT
cos
-
1
cos
=
5
•
ABC is a triangle in which AB = 4cm, AC = 5.4cm and BC = 8cm. Find
ACB∠ .
OPERATION
1. Use the formula
B
C
AC
ABBCAC
ACB
××
−+
=∠
2
cos
222
to determine ACB∠cos . Ensure
calculator is in
COMP/Deg mode.
ACB∠cos
= 0.893055555.
2. To determine ACB∠ , press
Hence,
ACB∠ is approximately 26.74°.
Answers to Quick Check 1
1 (a) -381.078125 (b) 5/42 (c) 210,034.1658 2 (a) 0.034899496 (b) 1 (c) 2
3 (a) 7,079.457844 (b) 2.724069927 (c) 21.10019602,@
0.368267893
4 755.0922277 5 1,096.633158 6 -12.05796327
7 (a) 1.966637001 (b) 4.289146637 (c) 11.35402128 8 (a) 178°11’23.5’’ (b) 133°41’24.5’’
(c) -166°9’27.94’’
9
°1.0cos
10 5.595526906
Answers to Quick Check 2
1 (a) 43,758 (b) 55,440 (c) 362,880 2 5, 10, 13
3 (a) 1,951 (b) 65.03333333 (c) 19.78633086 4 0.201653658 5 95,040 6 11,400
7 (a) 35.73496445° (b) 0.9125573
Exam
p
le 3
5.4
2
+8
2
-4
2
77.16
Ans¡(2 X5.4 X8
0.893055555
cos
-
1
Ans
26.74024593
8cm
4cm
5.4cm
B
C
A

Casio fx-350MS Specifications

General

Type	Scientific
Form factor	Pocket
Power source	Battery

Weight and Dimensions

Weight	100 g
Dimensions (WxDxH)	12.2 x 85 x 155 mm