Geometry Explorer Help

Using the Measure Menu:

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The items in the measure menu deal with measuring various geometric properties.  Additionally, there is the ablity to make tables of measurements.  Look here for an example of how to use tables.  The measurments available include:
 

  • x-Coordinate: Selection- point. Measures the x-coordinate of the point in the Euclidean coordinate system. (Euclidean canvas only)
  • y-Coordinate: Selection- point. Measures the y-coordinate of the point in the Euclidean coordinate system. (Euclidean canvas only)
  • Distance: Selection - 2 points or a point and a linear object (line, ray, segment). Measures the distance between the points (or the point and linear object).
  • Angle: Selection - 3 points (initial, vertex, terminal) Measures the oriented angle from the initial point to the vertex to the terminal point.
  • Defect: Selection -3 points. Measures the defect in a hyperbolic triangle. (Poincare canvas only)
  • Slope: Selection - linear object (line,ray,segment). Measures the slope of the linear object.  (Euclidean canvas only)
  • Length: Selection -segment. Measures the length of the segment.
  • Ratio: Selection - 3 points, 4points, or 2 segments.  Measures the ratio of two lengths. These two lengths can be defined three ways: 2 segments, two sets of endpoints (4 points), or three points (lengths are first-second and second-third).
  • Radius: Selection -circle or arc. Measures the radius of the circle or arc.
  • Circumference: Selection -circle. Measures the circumference of the circle.
  • ArcAngle: Selection - arc. Measures the angle defined by an arc and the center of the circle it lies on.
  • ArcLength: Selection - arc. Measure the length of an arc.
  • Perimeter: Selection - a filled polygon.  Measures the perimeter of the polygon.
  • Area: Selection - a filled polygon, circle, or arc. Measures the area of the object.

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  • Measure Input:  Use this option to create a user input box in the Canvas.  Numerical values typed in this box can then be used just like any other measured value.


    • Measurements are done by first selecting the objects that define the measurement and then choosing the appropriate measurement from the Measure menu.

    Look here for an interesting example that uses measurements extensively. (Level of example is advanced).