Rotating A Figure - Casio FX-9750G PLUS User's Manual & Technical Reference

Program for

Rotating a Figure

Description
Y
0
Graphing of rotation of any geometric figure by θ degrees.
Example
To rotate by 45° the triangle defined by points A (2, 0.5), B (6, 0.5), and C (5, 1.5)
Notes
• Use the cursor keys to move the pointer around the display.
• To interrupt program execution, press A while the graphic screen is on the display.
• The triangle cannot be drawn if the result of the coordinate transformation operation
exceeds View Window parameters.
Preparation and operation
• Store the program written on the next page.
• Execute the program as shown below.
A
x
1
B
y
1
C
x
2
D
y
2
E
x
3
F
y
3
G
x'
1
PROGRAM SHEET
C(x )
y
3, 3
A(x )
y
1, 1
H
y'
I
x'
J
y'
K
x'
L
y'
M
N
B(x )
y
2, 2
X
O
1
P
2
Q
2
R
3
S
3
T
U
No.
5
Formula for coordinate transfor-
mation:
x y ) → ( x' y'
( , , )
cos θ – sin θ
x' x y
=
y' x sin θ + y cos θ
=
V
W
X
Y
Z
425