Casio fx-CG50 User Manual page 551

3(POINTS) ... Select to input the coordinates of three points on a plane.
• Inputting a coefficient that matches any of the conditions below will cause an "Invalid Setting"
error.
• EXPRESS: a=0 and b=0 and c=0
• VECTOR:
• Both the u vector and v vector coefficient, or either the u vector or v vector coefficient is
0.
• u vector and v vector are the same direction.
• POINTS:
• Two of the three points are the same value.
• The three points are on a straight line.
u
Sphere Template
There are input screens for two types of coefficients.
1(FACTOR) ... Select to input the coefficients of (X−a)
2(EXPAND) ... Select to input the coefficients of X
• Inputting a coefficient that matches any of the conditions below will cause an "Invalid Setting"
error.
• FACTOR: r = 0 or less
• EXPAND: Input coefficients do not satisfy a
2
+(Y−b)
2 2 2
+Y +Z +aX+bY+cZ+d=0.
2 +b 2 +c 2 >4d.
16-11
2 2 2
+(Z−c) =r .