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1.

Quadrilaterals [electronic resource]

Stonehenge is thought of as being circular, but its structure is made possible by post-and-lintel construction-vertical supports and horizontal spans that create quadrilateral forms. In this program viewers learn why most homes are also made up of quadrilaterals as the concepts of rectangles, squares, parallelograms, trapezoids, and triangles within quadrilaterals are explored. The geometry of architecture is illustrated using Frank Lloyd Wright's Fallingwater, a landmark easily identified by its motif of rectangular shapes, and by the slanted towers of Puerta de Europa in Spain, that look like they are ready to collapse.
Online
2010
2.

Polygons and Angles: Discovery [electronic resource]

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The teachers tackle hands-on activities to investigate angle measurements and their relationships in triangles, quadrilaterals, pentagons, and other polygons.
Online
2000
3.

Polygons and Angles: In Practice [electronic resource]

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In this follow-up to Workshop 5, the teachers discuss how they taught the polygon lessons in their classrooms, learn to evaluate student work, and design new lessons.
Online
2000
4.

Measures of Quadrilaterals [electronic resource]: Geometry-Parallels and Polygons

In this video we'll learn how to find side lengths and interior angle measures of quadrilaterals, when we're given other measures of the quadrilateral. Specifically, we'll look at parallelograms, rhombuses, and rectangles.
Online
2015; 2014