Quadrilaterals

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Quadrilaterals

• By Mr. Bales

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Objective

• By the end of this lesson, you will be able to
  identify, describe, and classify quadrilaterals.
• Standard 4MG3.8 - Know the definitions of
  different quadrilaterals (rhombus, square,
  rectangle, parallelogram, trapezoid).

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Introduce

• Using the straws and tie wraps, you will be
  making shapes.
• Please follow the directions carefully.
• After each shape, we will take it apart before we
  begin the new one.

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Shape 1

• Using four straws of the same length, make a
  quadrilateral with all four sides equal in length
  and all right angles.
• What is this shape called?
• Now, pull two opposite corners of the square in
  opposite directions.
• Are the angles still right angles?
• Are the pairs of opposite sides still the same
  length?
• What is this new shape called?

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Square vs. Rhombus

• A square has four right angles, with opposite
  sides parallel. All sides are equal length.
• A rhombus has 4 equal sides and opposite sides
  are parallel.

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Shape 2

• Now, use two straws of one length and two straws
  of another length. Make a quadrilateral with the
  pairs of opposite sides the same length and all
  right angles.
• What is this shape called?
• Pull two opposite corners of the shape in
  opposite directions. Are the angles still right
  angles?
• Are the pairs of opposite sides still the same
  length?
• What is the new shape called?

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Rectangles vs. Parallelograms

• A rectangle has 4 right angles, with opposite
  sides equal and parallel.
• A parallelogram has opposite sides equal in
  length and parallel.

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Shape 3

• Using two straws of one length for the sides of
  the shape, and two completely different sized
  straws for the top and bottom, and make this
  quadrilateral. (So you should use 3 different
  straw lengths - same two sized for the sides -
  different one for top - and another different
  one for bottom.
• What quadrilateral is this?

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Trapezoid

• A trapezoid has at least 1 pair of parallel sides.

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Bales Bucks!!!
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Assignment

• Page 412 - s 8 - 21
• Get them all correct, No Math Homework