Casio FX-7400G User Manual page 161

Program for
Circle and Tangents
Description
With this program, slope
x' y'
A ( , ) and are tangent to a circle with a radius of
coordinates at the points of tangency, and factor zoom is used to enlarge the graph.
Example
m
To determine
r
= 1
x'
= 3
y'
= 2
Notes
• The point plotted for A cannot be moved. Even if it is moved on the graph, the calculation is
performed using the original value.
• An error (Ma ERROR) occurs when
• Be sure to always perform a trace operation whenever you select trace and the message
TRACE is on the display.
Preparation and operation
• Store the program written on the next page.
• Execute the program as shown below.
A
B
C
D
E
F
G
PROGRAM SHEET
Y
r
0
m
and intercept
b
and for the following values:
H
I
J
K
L
M
N
A
(x',y')
X
b y' mx'
(= – ) are obtained for lines drawn from point
r
. The trace function is used to read out the
r x'
= .
O
P
Q
R
S
T
U
No.
4
Formula for circle:
x y r
2 + 2 = 2
Formula for tangent line passing
x' y'
through point A ( ,
y y' m x x'
– = ( – )
m
* represents the slope of the
tangent line
V
W
X
Y
Z
):
158