1. Do Now DWP #62

2. 3/16/15 8-3 B Quadrilaterals and Angle Sums

3. 5 Types of Quadrilaterals -closed figure with four straight sides 1.Parallelogram 2.Rectangle 3.Rhombus 4.Square 5.Trapezoid

4. Parallelogram Opposite sides parallel Opposite sides congruent Opposite angles congruent

5. Opposite sides parallel Opposite sides and angles congruent Four right angles Sound Familiar?

6. Rhombus Opposite sides parallel Opposite sides and angles congruent ALL SIDES congruent Sound Familiar?

7. Square A rectangle with four congruent sides

8. Trapezoid One pair of parallel sides (bases)

9. Fun Fact In every quadrilateral there are 2 Triangles!

10. The sum of the angles of a triangle is 180 degrees. ALWAYS!

11. Remember there are 2 triangles in a quadrilateral….

12. Using that information how could we find the angle sum of a quadrilateral?

13. There are two triangles... Because the sum of the angles of each triangle is 180 degrees... We get 180 + 180 = 360 So, the sum of the interior angles of a quadrilateral is 360 degrees. ALWAYS!!!!!!

14. Again… The sum of the angles in any quadrilateral is always 360 o. We can use this fact to find missing angle measures in quadrilaterals.

15. Let’s Practice Ex. 1: Classify the figure. Find the missing angle measure.

16. Solution Ex.1 Trapezoid 109 + 86 + 71 + b = 360 195 + 71 + b = 360 266 + b = 360 - 266 -266 b = 94 o Let’s Check : 109 + 86 + 71 + 94 = 360

17. Ex. 2 Classify the figure. Find the missing angle measure.

18. Solution Ex.2 Quadrilateral 82 + 51 + 113 + x = 360 133 + 113 + x = 360 246 + x = 360 - 246 -246 x = 114 o Let’s Check : 82 + 51 + 113 + 114 = 360

19. Exit Ticket Pg. 470 # 1-10 Odds

20. Homework Pg. 470 #1-30 Evens