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20050501
k Drawing a Circle by Specifying the Coefficients of a General Equation
Example: To draw the circle x
2
+ y
2
+ 4x – 6y + 9 = 0
u ClassPad Operation
(1) In step (2) of the procedure under “Drawing a Circle by Specifying a Center Point and
Radius”, select “AX
2
+ AY
2
+ BX + CY + D = 0”.
(2) Substitute the following values for the coefficients: A = 1, B = 4, C = –6, D = 9.
4-3-5
Drawing a Conics Graph
Drawing an Ellipse
You can draw an ellipse by specifying coefficients for the standard equation:
Example: To draw the ellipse
u ClassPad Operation
(1) On the Conics Editor window, tap q, or tap [Form] and then [Insert Conics Form].
• This displays the Select Conics Form dialog box.
(2) Select “ ” and then tap [OK].
• This closes the Select Conics Form dialog box, and displays the selected equation in
the Conics Editor window.
(3) Change the coefficients of the equation as follows: A = 2, B = 3, H = 1, K = 2.
(4) Tap ^ to graph the equation.
(x – H)
2
+
(y – K)
2
= 1.
A
2
B
2
(x – 1)
2
+
(y – 2)
2
= 1
2
2
3
2
(X – H)
2
+
(Y – K)
2
= 1
A
2
B
2
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