Adding Expressions

Adding Expressions

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draw_expr 

You can type an algebraic expression in the drawing window and Geometry Expressions will solve it with whatever information it has available. Here are the steps:

  1. From the Draw toolbox click the Expression icon ebd_Ebd48  or select Expression from the Draw menu.
  2. Move the expression cursor ebd_Ebd49  to the position where you want it to appear in the drawing window and click to display the data entry box.
  3. Enter the expression using numbers, variables, and output expression names. Use the Symbols toolbox to help you enter mathematics.

Adding an expression to the diagram can help you work out relationships in the geometry. Here is an example making use of the Expression tool to see the relationship between similar triangles.

ebd_Ebd50 

Sides a and b are perpendicular, and AC is perpendicular to BD. We obtained the Output of lengths AD and BD using the Show Name button.

The expression to solve is the relationship of the two lengths: z0 / z1. The system immediately evaluates the expression as => a/b.