Quadrilaterals and other polygons
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Area of Parallelograms - Activity A
Examine and manipulate the graph of a parallelogram or triangle and find its area. Explore the relationship between the area of … a parallelogram and the area of a rectangle using an animation.
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Area of Parallelograms - Activity B
Explore the relationship between the area of a parallelogram and the area of a rectangle using an animation. Also, with the help of … an animation, see that any triangle is half of a parallelogram.
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Classifying Quadrilaterals - Activity B
Apply constraints to a quadrilateral, and then reshape and resize it. Classify the figure by its constraints. Explore the … differences between the different kinds of quadrilaterals.
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Parallelogram Conditions
Apply constraints to a dynamic quadrilateral. Then drag its vertices around. Determine which constraints guarantee that the quadrilateral … is always a parallelogram.
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Polygon Angle Sum - Activity A
Derive the sum of the angles of a polygon by dividing the polygon into triangles and summing their angles. Vary the number of sides … and determine how the sum of the angles changes. Dilate the polygon to see that the sum is unchanged.
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Polygon Angle Sum - Activity B
Derive the sum of the angles of a polygon by dividing the polygon into triangles and summing their angles. Vary the number of sides … and determine how the sum of the angles changes. Dilate the polygon to see that the sum is unchanged.
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Special Quadrilaterals
Apply constraints to a quadrilateral and determine what type of quadrilateral results.
