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u To construct a parallel
1. Draw a line segment, plot a point, and select the line and point.
2. Perform the following operation: 4(Construct) – 6:Parallel.
• This will draw an infinite line that is parallel to the selected line segment and passes
through the selected point. Marks (
) appear on both the line segment and the infinite line
to indicate they are parallel.
→
Note
You can perform a parallel construct operation while any of the following combination objects
is selected.
• A single line segment and a single point, a single line and a single point, a single ray and a
single point, a single vector and a single point
• One side of a polygon and a single point
u To construct a tangent
1. Draw a circle.
2. Perform the following operation: 4(Construct) – 7:Tangent.
• This will cause the message “Select Curve” to appear.
3. Move the pointer close to the location on the circle where you want to construct the tangent.
• Move the pointer towards the circle until
marks appear on it.
4. Press w.
• This will draw a line that is tangent to the circle at the location you selected with the
pointer.
→
Note
You can perform the tangent construct operation while a circle, semi circle, arc, or function
graph is selected.
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