Texas Instruments TINSPIRECX manual What’s grabbable?, Construct the Triangle

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The next step is to draw a line parallel to BC. This is a construction so you need to press bA.

Choose option 2: Parallel.

You must specify two things: the line to which it is to be parallel, and a point the line must pass though (although these can be chosen in either order). So move the cursor to the segment BC––you will see its label when you are in the right position. Click (x) to select the segment, move away, dragging a dotted parallel line and when happy with its position click again. Once again, don’t forget to press d, if you do not want to add another parallel line.

First Steps with TI-Nspire™

Tutorial 5: Geometry

Many options in the Construction menu

What’s grabbable?

At this point it is worth moving the cursor around the screen to see which objects can be grabbed and dragged.

You should see the open hand cursor (÷) appear for point B, for point C, for the segment BC, and for the point fixing the parallel line. All of these are grabbable.

However, the parallel line itself cannot be grabbed and dragged. It can however be selected for various purposes. For example, you could delete it by clicking (x) to select it and then pressing . to remove it.

Construct the Triangle

First, a point A is needed on the parallel line. Later you will be sliding this point along the line without moving the line itself, so the point that you have already which defines the line is not a good one to use. Therefore press b72 to select the option: Point On. Move the cursor to a new position on the line and then click (x) then press: gAd. The triangle itself can be constructed using the Shapes menu (b92). Check that the correct icon is showing in the top left corner, and then carefully select, in any order, each of the points

A, B and C.

Make certain you don’t click until its label and the pointing- finger icon appears as shown here.

Selectable, but not grabbable!

Point A is ready to be selected

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© 2012 Texas Instruments Education Technology

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Contents First Steps About this document Contents Appendix TI-Nspire CX Keypad Layout TI-Nspire Documents Nothing on the screen?Memory Battery Life Charging the handheldHome Screen First Steps with TI-Nspire Tutorial 1 TI-Nspire documents Documents, Problems and Pages ScratchpadNavigating Documents First Steps with TI-Nspire Tutorial 1 TI-Nspire documents Contextual Menus Check list of some key points in Tutorial Calculator Application Basic operationsHistory Lesson Approximate CalculationsTemplates Menu of maths templatesDocument settings dialog box Effect of changed settingsGetting Set Some Algebra Ways to define variablesUse of function notation Calculator Menu Statistical Distribution TablesLists of random integers Variables Linked to Documents List of defined variablesWhy use Notes? Making NotesVarious text formatting Instructions Recording results Splitting the Screen Format sub-menuWays to split the screen You must press /e and then b An inserted comment Use of proof template and symbols More Options from the Notes MenuInteractive Notes Use of Q+A templateAsking Questions Check list of some key points in Tutorial Graphing Graphs & Geometry Two ViewsGraphing Functions Graphing ViewGrab and Drag Practice Changing the AxesOpen-hand cursor Grabbed tick mark on the axesZoom settings Grabbed-sheet icon Editing, Deleting or Hiding a FunctionChanging f2 in the function history Tracing Graphs Points and coordinatesTrace picks out significant points Points of intersectionAnalyse Graph Menu Coordinates and labelled pointsUsing Sliders Manually Moving GraphsAlternative icons Transformed graph and equation Sequence Plotting Check list of some key points in Tutorial Geometry View for Plane GeometryTwo Parallel Lines Drawing the base of the triangleWhat’s grabbable? Construct the TriangleMany options in the Construction menu Making Measurements Variables and TextMeasurement menu Storing the measurement as a variableTidying Up and Using Attributes Dynamic ChangesReady to grab a and slide it Changing the attributes of the triangleArea is now locked Unlocked/Unpinned Points B and C. Try Moving point BCheck list of some key points in Tutorial Lists & Spreadsheet Entering Data as ListsUsing Formulae Conflict resolutionOne way to enter a formula Typical Spreadsheet Actions Capturing Data Function TablesHand-made function table Simple function table Options for function tables Graph and table side by sideFrequency Charts Charts with One Variable One and Two Variable StatisticsShoe Sizes and Hand Spans Charts for Categorical Data Pie Chart displaying categorical dataComparing Boxplots Upper quartile displayedCharts with Two Variables Fitting a Line by Hand and EyeReady to add a 2nd variable Drawing the Regression Line Getting the StatsCalculated regression line Statistics Calculations menu Dragging on the Charts Working with Frequency DataSets of statistics Effect of moving a point from here … … to hereTexas Instruments Education Technology Check list of some key points in Tutorial Multiple Representations Draw and Measure a CircleMeasured circle Setting up a scatter plot Data capture is under way Spreadsheet for Data CaptureTwo Scatterplots Collecting Just a Little DataGo to Town with Data Collection Fit a Straight LineLinear relationship Moving a straight line by hand Not a linear relationshipDifferent Approach to Scatterplots RegressionBasic quadratic ready for fitting… … and dragged into place
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