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k Calculation Using the Surface Area of Displayed Figures
You can use the procedures in this section to perform calculations using the surface area of
figures, and display both the expression and calculation results. For example, calculation of
the sum of the surface areas of triangle ABC and triangle A’B’C’ can be displayed as shown
below.
Figures that can be specified for a calculation are those with fill colors (those whose Area
Color is anything other than “Clear”). For information about the Area Color setting, see
“Specifying the Color and Line Type of a Displayed Object” (page 14-21).
u To perform a calculation using the surface area of displayed figures
Example: To calculate the sum of the surface areas of two displayed triangles,
and display the expression and calculation results
1. Draw the triangles, and then specify blue for the Area
Color of one, and red for the Area Color of the other.
2. Perform the following operation: K(Option) – 7:Area Calc.
• This display the measurement box with one of the triangles highlighted. The highlighted
figure is the one that is currently selected for surface area calculation. You can use d
and e to move the highlighting between the two figures.
3. Select the first figure to be calculated (the left one in this example) and then press w.
• This will highlight the measurement box, indicating that
the contents of the box can be edited.
• “@1 DABC” appears on the left triangle, and “@1” (the
symbol for DABC) is input into the measurement box.
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