Casio fx-3650P Programming Guide

25
16 Finding the angles in a triangle
Law of cosines：The relationship between the length
of the sides of a triangle and the angle between is
given by:
Solving this for we obtain the angle in terms of the
lengths:
Program
？ → Ａ：？ → Ｂ：？ → Ｃ：Ｃ Ｏ Ｓ
－１
（（Ｂ
２
＋Ｃ
２
－Ａ
２
）÷２ ＢＣ）→ Ｄ：Ｄ ＜ 33 STEP ＞
Execution Example:
Find the angle in a triangle with sides of length 3, 4 and 5.
To obtain the answer in radians press before
executing the program.
a
2
b
2
c
2
2bc θ cos–+=
a
b
c
θ
θ
1–
cos
b
2
c
2
a
2
–+
2bc
-----------------------------=
ON
MODE MODE MODE
1
PRGM
MODE
1
COMP
1
P1
MODE MODE
MODE MODE
1
DEG
S A
D R P1
P1
P2 P3 P4 G
Prog
1
5
EXE
S A
D R P1
P1
P2 P3 P4 G
4
EXE
S A
D R P1
P1
P2 P3 P4 G
3
EXE
S A
D R P1
P1
P2 P3 P4 G
8
MODE MODE MODE MODE
2
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Casio fx-3650P Specifications

General

Type	Scientific
Form factor	Pocket
Housing material	Plastic
Digits	12 digits
Digit comma separator	Yes
Display number of lines	2 lines
Digit comma separator format	Standard (3 digits)
Battery type	LR44
Number of batteries supported	1

Weight and Dimensions

Weight	100 g
Dimensions (WxDxH)	78 x 157 x 12 mm