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5 – Quadrilaterals and Other Polygons

  • Do you live in a green home? Not the color green– one that’s energy efficient. One key lies in the shape of your house. A house in the shape of an octagon has windows that face in more directions, and allow more sunlight in. This is just one application of polygons.
  • Polygons are figures with three or more sides. You’ll learn their names, and how to find their perimeters, areas, and angles.
  • Look at the octagon house again. Notice how the wider angles allow for brighter corners.
  • Open all the doors, and the wind can take a direct path through the house, providing cooling. This design feature depends on diagonals. You’ll learn to draw diagonals and interior triangles, and see an interesting pattern.
  • You’ll also meet the quadrilaterals, four-sided polygons, as well as parallelograms, rhombi, squares, and rectangles. Rectangles and squares might seem pretty ordinary, but their properties ensure that our building stay straight.
  • What if a quadrilateral has only one pair of parallel sides? Then you have a trapezoid– a surprisingly sturdy shape that has stood the test of time.
  • Get ready to see how our world is built on the properties of polygons.

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