HP Prime Graphing Wireless Calculator Manuel d'utilisateur Page 199

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2.
Tap anywhere on the graph, press and then press .
Notice that a point is added to the graph and given a name (B in this example). Tap a blank area of the
screen to deselect everything. (Objects colored light blue are selected.)
Adding a tangent
1. We will now add a tangent to the curve, making point B the point of tangency:
> Line > Tangent
2.
When prompted to select a curve, tap anywhere on the curve and press . When prompted to
select a point, tap point
B and press to see the tangent. Press to close the
Tangent tool.
Depending on where you placed point B, your graph might be dierent from the following gure. Now,
make the tangent stand out by giving it a bright color.
Getting started with the Geometry app 151
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