Casio fx-CG50 User Manual page 558

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Determining the Intersect of Straight Lines or Planes (Not available
with the fx-CG50 AU, fx-CG20 AU)
You can determine the combinations below for intersection points and intersecting lines.
• Line-line ... Point of intersection
• Line-plane ... Point of intersection
• Plane-plane ... Line of intersection
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To determine a line-line point of intersection
1. Use the Line template to register the two straight line functions below.
Straight line 1: P1=0,0,0
Straight line 2: P1=1,1,0
2. Press 6(DRAW) to draw the 3D graph.
3. Press !5(G-SOLVE)2(INTSECT).
• This displays the coordinates of the intersect. (In the case of plane-plane, the function of
the line of intersection will appear on the display.)
4. To delete the intersect display, press J.
• The message "NOT FOUND" will appear if the two 3D graphs do not intersect.
• The message "INFINITE" will appear if the two 3D graphs are identical.
• When there are three straight lines or planes, you can change how they are combined by
pressing 1(Next)/2(Back).
• To find intersection, you must use the Line template or Plane template to draw two or more
3D graphs.
P2=1,1,1
P2=2,2,2
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