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Program sheet, Rotating a figure – Casio fx-9750G PLUS User Manual

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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

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