Quadrilaterals

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Quadrilaterals

  1. 1. <ul><li>“Quad” means four. Why would all of these shapes be called “ quad rilaterals”? </li></ul><ul><li>Each shape has four sides. </li></ul>square parallelogram rhombus rectangle Quadrilaterals trapezoid
  2. 2. In this slide show you will learn that we identify quadrilaterals by: and the length of their sides. their angles
  3. 3. Square <ul><li>A square has four sides that are each the same length. </li></ul><ul><li>It also has four right angles (perfect corners). </li></ul>1 2 3 4
  4. 4. Rhombus <ul><li>A rhombus has four sides that are each the same length. </li></ul><ul><li>But it has two acute and two obtuse angles. </li></ul>acute acute obtuse obtuse
  5. 5. Square and Rhombus <ul><li>A square and a rhombus both have four sides that are the same length. So, how are they different? </li></ul>
  6. 6. Square and Rhombus <ul><li>A rhombus can be thought of as a slanted square. </li></ul><ul><li>If we push on the left-hand side of this square, it might end up looking like… </li></ul>a rhombus.
  7. 7. The only difference between a square and a rhombus is their angles .
  8. 8. Trapezoid <ul><li>A trapezoid has four sides. </li></ul><ul><li>Two sides are parallel. </li></ul><ul><li>The opposing two sides are not parallel. </li></ul>Those are parallel. Those are not parallel.
  9. 9. Rectangle <ul><li>A rectangle has four sides – two long sides and two short sides. </li></ul><ul><li>Two sides are parallel. </li></ul><ul><li>The opposing two sides are also parallel. </li></ul><ul><li>It also has four right angles. </li></ul>
  10. 10. Parallelogram <ul><li>A parallelogram has four sides – two long sides and two short sides. </li></ul><ul><li>Two sides are parallel. </li></ul><ul><li>The opposing two sides are also parallel. </li></ul><ul><li>But, it has two acute and two obtuse angles. </li></ul>
  11. 11. Rectangle and Parallelogram <ul><li>A parallelogram can be thought of as a slanted rectangle. </li></ul><ul><li>If we push on the left-hand side of this rectangle, it might end up looking like… </li></ul>a parallelogram.
  12. 12. The only difference between a rectangle and a parallelogram is their angles .
  13. 13. Use the following table to make comparisons using the quadrilaterals. For example, what do a square and a rectangle have in common?
  14. 14. Quadrilaterals 2 sets 2 acute 2 obtuse 2 long, 2 short Parallelogram 2 sets 4 right angles 2 long, 2 short Rectangle 1 set different angles different lengths Trapezoid 2 sets 2 acute 2 obtuse 4 same length Rhombus 2 sets 4 right angles 4 same length Square PARALLEL LINES ANGLES SIDES SHAPE

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