HP Prime Graphing Wireless Calculator Manuel d'utilisateur Page 230

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4.
Tap a nal location and press .
The object is moved the same distance and direction from the initial to the nal locations. The original
object is left in place.
Reection
A reection is a transformation which maps an object or set of points onto its mirror image, where the mirror
is either a point or a line. A reection through a point is sometimes called a half-turn. In either case, each
point on the mirror image is the same distance from the mirror as the corresponding point on the original. In
the following gure, the original triangle D is reected through point I.
1.
Tap , tap Transform, and select Reection.
2. Tap the point or straight object (segment, ray, or line) that will be the symmetry axis (that is, the mirror)
and press .
3.
Tap the object that is to be reected across the symmetry axis and press . The object is
reected across the symmetry axis dened in step 2.
182 Chapter 9 Geometry
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