Quadrilaterals are shapes that have four sides. They can be classified based on their angles or pairs of sides. Some common types of quadrilaterals are rectangles, which have four right angles, squares which are rectangles with four equal sides, rhombi which have four equal sides but not necessarily right angles, and trapezoids which have only one pair of parallel sides. The key difference between a square and rhombus is that a square has four right angles while a rhombus does not necessarily have right angles.

1. Topic 9 Lesson 9-6 QUADRILATERALS

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

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

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.