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1.
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Press the Œ key and select Cabri™ Jr. |
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a)
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Press p to open the F2 menu. |
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c)
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Move the pencil using the| ~ } † keys to a location for the first vertex. Press [enter]. |
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d)
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Move the pencil using the | ~ } † keys to a location for the 2nd vertex. Press [enter]. |
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e)
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Move to a 3rd vertex. Press [enter]. |
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4.
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Press s to open the F5 menu. |
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5.
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Highlight Measure, press the right cursor, and select Angle. |
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6.
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Measure one of the interior angles of the triangle. |
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a)
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Move the pencil to one of the vertex points. Press [enter]. |
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b)
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Move the pencil to the vertex of the angle being measured. The vertex point will blink. Press [enter]. |
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c)
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Move the pencil to the third vertex. Press [enter]. |
Note: The App will calculate and display the angle measurement near the angle being measured. To drag the numerical measurement to a desired location, use any of the | ~ } † keys. Press [enter] when the angle measurement arrives at the desired location.
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7.
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Repeat step 6 to find the angle measurements of the other two interior angles of the triangle. |
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8.
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Calculate the sum of the three interior angles. |
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a)
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Press s to open the F5 window. |
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c)
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Move the arrow to one of the numerical angle measurements. The number will begin blinking when the angle is selected. Press [enter]. |
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d)
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Press à key from the keypad. |
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e)
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Move the arrow to another angle measurement until it starts blinking. Press [enter]. |
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f)
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The sum of the two angles selected will be output and you can drag them by using the | ~ } † keys. Move the new calculation to a desired location and press [enter]. |
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g)
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Point to the new calculation until it starts blinking (sum of the 2 angles) and press [enter] to select it. |
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i)
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Move the arrow to the measurement for the unselected 3rd angle. Press [enter]. |
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j)
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The calculation output will represent the sum of all three interior angles. Move the new calculation to a desired location and press [enter]. |
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9.
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Press ‘ to stop the measurement tool and move the arrow to one of the three triangle vertices. The arrow will become “hollow” to indicate that the vertex being selected. |
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10.
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Press the ƒ key once, and use any of the |~}† keys to drag the vertex to a different location.
Note:When the arrow is near a geometric object, press ƒ to turn the arrow into a hand icon so that you can drag the object.
Notice that the angle measurements change accordingly as the triangle changes shape, but their sum is always the same. |
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