Centering. Use the + and − buttons or arrow keys to center the red dot on the gray line. When the dot appears to be centered, press the measure button (0% is exactly centered). This is easy with the line alone, but what if the line is inside a triangle? Use the arrow buttons or arrow keys to center the red dot in the shape. When the dot appears to be centered, press the measure button (0% is exactly centered). This seems straightforward with a rhombus or circle, but what about a triangle? Next, show the options and try the suggestions in the Further Exploration section of this chapter.
Copy this link to duplicate your custom settings.