Hp Prime Graphing Calculator Manuel d'utilisateur télécharger pdf (Page 141)

100

101

Geometry 137

Add a tangent 8. We will now add a tangent to the curve, making point B

the point of tangency:

> More > Tangent

9. Tap on point B, press

E and then press J.

A tangent is drawn

through point B.

(Depending on where

you placed point B, your

illustration might be

different from the one at

the right.)

We’ll now make the

tangent stand out by giving it a bright color.

10. If the curve is selected, tap a blank area of the screen to

deselect, and then tap on the tangent to select it.

11. Press

Z and select Change Color.

12. Pick a color from the color-picker, press

E and then

tap on a blank area of the screen. Your tangent should

now be colored.

13. Press

E to select point B.

If there is only one point on the screen, pressing E

automatically selects it. If there is more than one point, a

menu will appear asking you to choose a point.

14 . Wi t h p oi nt B selected, use the cursor keys to move it

about.

Note that whatever you do, point B remains constrained

to the curve. Moreover, as you move point B, the tangent

moves as well. (If it moves off the screen, you can always

bring it back by dragging your finger across the screen

in the appropriate direction.)

15. Press

E to deselect point B.

Note that there are two ways to move a point after it is

selected: (a) using the cursor keys, as described above, and

(b) using your finger. If you use the cursor keys, pressing

will cancel the move and put the point back where it was,

while pressing

E will accept the move and deselect the

point. If you use your finger to move the point, lifting your

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Hp Prime Graphing Calculator Manuel d'utilisateur Page 141

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