Texas Instruments TINSPIRECX manual Area is now locked

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This brings up the contextual menu which gives the options available for the option displayed. To change the shading select Colour then Line Colour or Fill Colour which will open a colour picker from which you can choose a colour.

Now move the cursor to point B and right click again (/b). This gives you the contextual menu for the point, one option here is to Pin the point, which will prevent users from grabbing and moving it. For example, there may be good pedagogic reasons for only allowing point A to move in this activity. For the moment pin points B and C.

To unpin an object just right-click on the object again and select Unpin.

Continue to move the cursor around the screen and see the options for changing the attributes of the parallel line and also the area measurement. When you look at the attributes for the area calculation you will see the option of a padlock. Locking the measurement will fix the current value constraining movement of other points accordingly.

First Steps with TI-Nspire™

Tutorial 5: Geometry

Area is now locked

Locking some objects and unlocking others can have very interesting effects and if you have time you may care to investigate the following situations.

a)Locked/Pinned: The area measurement.

Unlocked/Unpinned: Points B and C and the parallel line through A. Try Moving point B

b)Locked/Pinned: The area measurement and the parallel line through A.

Unlocked/Unpinned: Points B and C. Try Moving point B

Once again save your document as FirstSteps6 before going any further.

© 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 Charging the handheld Battery LifeHome Screen First Steps with TI-Nspire Tutorial 1 TI-Nspire documents Scratchpad Documents, Problems and PagesNavigating Documents First Steps with TI-Nspire Tutorial 1 TI-Nspire documents Contextual Menus Check list of some key points in Tutorial Basic operations Calculator ApplicationApproximate Calculations History LessonMenu of maths templates 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 List of defined variables Variables Linked to DocumentsWhy 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 Use of Q+A template An inserted comment Use of proof template and symbolsMore Options from the Notes Menu Interactive NotesAsking Questions Check list of some key points in Tutorial Graphing View GraphingGraphs & Geometry Two Views Graphing FunctionsGrabbed tick mark on the axes Grab and Drag PracticeChanging the Axes Open-hand cursorZoom settings Grabbed-sheet icon Editing, Deleting or Hiding a FunctionChanging f2 in the function history Points of intersection Tracing GraphsPoints and coordinates Trace picks out significant pointsCoordinates and labelled points Analyse Graph MenuUsing Sliders Manually Moving GraphsAlternative icons Transformed graph and equation Sequence Plotting Check list of some key points in Tutorial Drawing the base of the triangle GeometryView for Plane Geometry Two Parallel LinesWhat’s grabbable? Construct the TriangleMany options in the Construction menu Storing the measurement as a variable Making MeasurementsVariables and Text Measurement menuChanging the attributes of the triangle Tidying Up and Using AttributesDynamic Changes Ready to grab a and slide itUnlocked/Unpinned Points B and C. Try Moving point B Area is now lockedCheck list of some key points in Tutorial Entering Data as Lists Lists & SpreadsheetUsing Formulae Conflict resolutionOne way to enter a formula Typical Spreadsheet Actions Capturing Data Function TablesHand-made function table Graph and table side by side Simple function table Options for function tablesFrequency Charts Charts with One Variable One and Two Variable StatisticsShoe Sizes and Hand Spans Upper quartile displayed Charts for Categorical DataPie Chart displaying categorical data Comparing BoxplotsCharts 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 Effect of moving a point from here … … to here Dragging on the ChartsWorking with Frequency Data Sets of statisticsTexas Instruments Education Technology Check list of some key points in Tutorial Multiple Representations Draw and Measure a CircleMeasured circle Collecting Just a Little Data Setting up a scatter plot Data capture is under waySpreadsheet for Data Capture Two ScatterplotsMoving a straight line by hand Not a linear relationship Go to Town with Data CollectionFit a Straight Line Linear relationshipDifferent Approach to Scatterplots RegressionBasic quadratic ready for fitting… … and dragged into place