Geometry and the TI-‐NspireTM CX Creating an Labeling a Triangle 1. Open a new TI-‐Nspire CX document and choose “Geometry”. 2. Press “Menu” “Shapes” and choose a shape that you would like to create. We will create a triangle in the example. (See Figure 1) Move the cursor and press “Click” three times until the triangle is created. (See Figure 2)
Figure 1
Figure 2
3. To label the figure, press “Menu” “Actions” “Text”. (See Figure 3) 4. Next, move the cursor to each point (make sure that the cursor indicates “point”), press “Click”, and type the letter desired for the point. Press “Click” when finished typing each point label. (See Figure 4) Press “ctrl” “shift” for ALL CAPS. 5. Repeat step 4 for each point.
Figure 3
Figure 4
Measuring Angles 1. Press “Menu” “Measurement” and choose a type of measurement. We will measure angles in the example. (See Figure 5) 2. Measure each angle just as you name an angle; move from one point to the next, where the vertex of the angle desired is the second point selected. Move the cursor to the location of a point (make sure that you see the word “point”) then press “Click”.
Figure 6
Figure 5
3. Repeat step 2 for each point in order until the angle measurement is shown. (See Figure 6)
4. Repeat steps 2 and 3 for the remaining two angles. Press “ESC” to remove the icon in the upper lefthand corner. (See Figure 7) 5. Grab and move any labels or measurements by pressing and holding “Click” on the item that you want to grab. Then brush your finger across the TouchPad to move the item.
6. If you ever see items “flashing” and cannot grab properly, press “Esc” and try step 5 again.
Figure 7
Creating Calculations 7. Calculate the sum of the measures of the angles of a triangle: A. Create a text box: “Menu” “Actions” “Text” B. Move your cursor to a convenient location and press “Click” to open the textbox. C. Type “A+B+C” D. Press “Menu” “Actions” “Calculate,” move the cursor to the textbox from step C, and press “Click” (See Figure 8) E. Press “Click” on each of the three angle measurements. F. Move the result of the calculation (180) to a convenient location and press “Click”. G. Press “esc” to eliminate the icon in the upper lefthand corner. 8. To increase the number of decimal places, hover over the measurement in question until you see the word “text”, then press “+”. (See Figure 9) 9. Move the cursor to any point until you see an open hand—make sure “Point” is indicated, not “Label,” then grab that point by pressing and holding “Click” until the hand closes.
10. Move the point by brushing your finger across the TouchPad and notice the total sum of the angles as the angle measurements change. (See Figure 10)
Figure 8
Figure 9
Figure 10
CAMT 2017 Session 2171 The TI-‐NspireTM CX Technology—Activities for Beginners Valerie Hudson Texas Instruments Instructor
Vhudsonmath.weebly.com
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