Casio fx-9750G PLUS - Manual (Page 453)

425
PROGRAM SHEET
No.
5
Program for
Rotating a Figure
Description
Formula for coordinate transfor-
mation:
( x , y ) → ( x' , y' )
x' = x cos θ – y sin θ
y' = x sin θ + y cos θ
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
B
C
D
E
F
G
x
1
y
1
x
2
y
2
x
3
y
3
x'
1
y'
1
x'
2
y'
2
x'
3
y'
3
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
0
X
Y
B(x
2,
y
2
)
A(x
1,
y
1
)
C(x
3,
y
3
)
Memory
Contents