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Topic 9 Lesson 9-6

QUADRILATERALS. Topic 9 Lesson 9-6. “Quad” means 4. Figures with four sides are called “quadrilaterals”. Quadrilaterals can be classified by their angles or pairs of sides. “Poly” means “many”. So any polygon with 4 sides is called a “quadrilateral” because it has many sides.

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Topic 9 Lesson 9-6

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  1. QUADRILATERALS Topic 9 Lesson 9-6

  2. “Quad” means 4. Figures with four sides are called “quadrilaterals”.

  3. Quadrilaterals can be classified by their angles or pairs of sides.

  4. “Poly” means “many”. So any polygon with 4 sides is called a “quadrilateral” because it has many sides.

  5. Let’s look at some different types of quadrilaterals. rhombusparallelogram trapezoidrectanglesquare

  6. rectangle 4 right angles also called a parallelogram

  7. rhombus opposite sides are parallel and all sides are the same length

  8. square 4 right angles All sides are the same length. It is a parallelogram, rhombus, & a rectangle.

  9. What is the difference between a rhombus and a square? A square has 4 right angles. A rhombus does not.

  10. So a square is also a rhombus, but a rhombus is not a square!

  11. parallelogram 2 pairs of parallel sides

  12. trapezoid only one pair of parallel sides

  13. Now you can recognize quadrilaterals.

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