Interactive Geometry Dictionary Areas in Geometry

  • Interactive Geometry Dictionary: Areas in Geometry

    Grade: 3rd to 5th, 6th to 8th

    One of the most important measurements in geometry is the measurement of area. The applets in this Interactive Geometry Dictionary (IGD) will show you how to find the area of some common shapes.

    The areas of the three shapes shown here are all related to each other. You can find the area of a triangle using the area of a parallelogram, which in turn can be found using the area of a rectangle. Click on the three items below to explore these relationships.


    Use the hyperlinks to be taken to Java Sketchpad interactives that will help you explore the areas of:

    1. Rectangles
    2. Parallelograms
    3. Triangles



    Objectives and Standards

    NCTM Standards and Expectations
    • Geometry / Measurement
    • Understand that by similarity, side ratios in right triangles are properties of the angles in the triangle, leading to definitions of trigonometric ratios for acute angles.
    • 3-5
    • 6-8
    • Geometry