Measuring Objects
Measurement values update automatically as you manipulate the measured object.
Note: Measurements of objects created in the Graphs application are displayed in generic units named u. Measurements of objects created in the Geometry application are displayed in centimetres (cm).
Measuring Length of a Segment, Circle Arc or Vector
| 1. | From the Measurement menu, select Length. (In the Graphs application, click Geometry > Measurement > Length.) |
| 2. | Click the object to display its length. |
| 1. | From the Measurement menu, select Length. (In the Graphs application, click Geometry > Measurement > Length.) |
| 2. | Click the first point. |
| 3. | Click the second point or a point on the line or circle. |
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| 1. | From the Measurement menu, select Length. (In the Graphs application, click Geometry > Measurement > Length.) |
| 2. | Click the object to display its circumference or perimeter. |
| 1. | From the Measurement menu, select Length. (In the Graphs application, click Geometry > Measurement > Length.) |
| 2. | Click two points on the object that form the side you want to measure. |
Note: You must click two points to measure a side. Clicking the side measures the entire length of the object's perimeter.
Note: You cannot measure the area of a polygon constructed using the Segment tool.
| 1. | From the Measurement menu, select Area. (In the Graphs application, click Geometry > Measurement > Area.) |
| 2. | Click the object to display its area. |
| 1. | From the Measurement menu, select Slope. (In the Graphs application, click Geometry > Measurement > Slope.) |
| 2. | Click the object to display its slope. |
The value is updated automatically when you manipulate the object.
Measured angles in the Geometry application range from 0° to 180°. Measured angles in the Graphs application range from 0 radians to π radians. To change the angle unit, use the Settings menu.
| 1. | From the Measurement menu, select Angle. (In the Graphs application, click Geometry > Measurement > Angle.) |
| 2. | Click three locations or points to define the angle. The second click defines the vertex. |
| 1. | From the Measurement menu, select Directed Angle. (In the Graphs application, click Geometry > Measurement > Directed Angle.) |
| 2. | Click three locations or existing points to define the angle. The second click defines the vertex. |
| 3. | To reverse the measurement orientation, |
| a) | On the Actions menu, select Attributes. |
| b) | Click the angle text. For example, click 300°. |
| c) | Select the orientation attribute, and use the right or left arrow key to change it. |
| d) | Press Esc to close the Attributes tool. |
| ▶ | Drag the measurement to the desired location. |
Note: If you move a measurement too far from its object, it stops following the object. However, its value continues to be updated as you manipulate the object.
You can set the length of a side of a Triangle, Rectangle or Polygon by editing its measured value.
| ▶ | Double-click the measurement, and then enter the new value. |
Use this method to create a variable and assign a measured value to it.
| 1. | Display the item's context menu, and select Store. |
| 2. | Type a variable name for the stored measurement. |
Use this method to assign a measured length value to an existing variable.
| 1. | Display the measurement's context menu, and select Variables > Link to. |
The menu shows the list of currently defined variables.
| 2. | Click the name of the variable you want to link to. |
| ▶ | Display the measurement's context menu, and select Delete. |
| 1. | Display the measurement's context menu, and select Attributes. |
| 2. | Use the up/down arrow keys to highlight the Lock attribute. |
| 3. | Use the left/right arrow keys to close or open the lock. |
As long as the value remains locked, manipulations are not allowed that would require the measurement to change.