1. Quadrilaterals
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2. Warm Up 1). 2). 3). Equilateral, acute Isosceles, obtuse
Classify each triangle by its sides and angles.
1).
2).
3).
Equilateral, acute
Isosceles, obtuse
Scalene, right
4). A triangle has an angle that measures 35◦ and another angle that measures 67◦. What is the measure of the third angle?
78 degrees

3. Quadrilateral Flippable

4. 180° + 180° = 360° Quadrilaterals The sum of the angles in a
quadrilateral is 360°.
180° + 180° = 360°

5. Find the value of x for each quadrilateral.
1).
X = 130°
2).
X = 140°

6. Parallelogram Opposite sides are parallel.
Opposite sides are congruent (=).

7. Rectangle Opposite sides are parallel. Opposite sides are congruent.
Four right angles.

8. Square Opposite sides are parallel. Four sides are congruent.
Four right angles.

9. Rhombus
Opposite sides are parallel.
Four sides are congruent.

10. Trapezoid
One pair of opposite sides parallel.

11. Parallelogram, rhombus
Practice
Give all of the possible names for each quadrilateral. Circle the name that is the best name for the figure.
parallelogram
1). 2).
3). 4).
Parallelogram, rhombus
Parallelogram, rectangle
Trapezoid

12. Closure
How is a trapezoid different from a rectangle? How are they alike?