HP Prime Graphing NW280AAABA manual 142

Creating or selecting an object always involves at least two steps: tap and press E. Only by pressing Edo you confirm your intention to create the point or select an object. When creating a point, you can tap on the screen and then use the cursor keys to accurately position the point before pressing E.

Note that there are on-screen instructions to help you. For example, Hit Center means tap where you want the center of your object to be, and Hit Point 1 means tap at the location of the first point you want to add.

You can draw any number of geometric objects in Plot view. See “Geometric objects” on page 153 for a list of the objects you can draw. The drawing tool you choose—line, circle, hexagon, etc.—remains selected until you deselect it. This enables you to quickly draw a number of objects of the same type (such as a number of hexagons). Once you have finished drawing objects of a particular type, deselect the drawing tool by press J. (You can tell if a drawing tool is still active by the presence of on-screen help at the top left-side corner of the screen, help such as Hit Point 1.)

An object in Plot view can be manipulated in numerous ways, and its mathematical properties can be easily determined (see page 150).

Object naming Each geometric object you create is given a name. In the example shown on page 141, note that the circle has been named C. Each defining point is also been named: the center point has been named A, and the point tapped to set the radius of the circle has been named B.

It is not only the points that define a geometric object that are given a name. Every component of the object that has any geometric significance is also named. If, for example, you create a hexagon, the hexagon is

given a name as is each point at each vertex. In the example at the right, the pentagon is named C, the points used to define the hexagon are named A and B, and the remaining

142 Geometry