1. Warm-up:
In Lesson 14 (in Desmos Activity), you reviewed a Standard from 7th Grade:
7.G.5 Use facts about supplementary, complementary, vertical, and adjacent angles in a multi-step problem to write and solve simple equations for an unknown angle in a figure.
THREE-MINUTE TASK:
Describe in as much detail as you can what you know about the figure shown to the left.

9. Work together to classify the triangle below using its angles and sides.
Look at each angle.
Are they acute, right, or obtuse?
Are the sides of the triangle congruent?
One angle is obtuse. No sides are congruent.
The triangle shown is a scalene obtuse triangle.

11. isosceles right Page 135 What information is given?
What does the term isosceles mean in any triangle?
What does the term right mean in any triangle?
isosceles
right

12. Page 135

13. Page 136
“In order to map Polygon A to Polygon B, I would: ______________________________”

14. Page 136
“In order to map Polygon A to Polygon B, I would: ______________________________”

15. Page 136
“In order to map Polygon A to Polygon B, I would: ______________________________”

16. Page 139

17. Page 139 E D

18. Page 141
Angle DBE 
 Angle CBE

19. Page 142
Prompts:
What transformation is used to bring Triangle CBA to Triangle CDE?
What transformation is used to bring Triangle CBA to Triangle GFE?
What transformation is used to bring Triangle CBA to Triangle GHA? o 53

20. Page 143 Notice: x and z are alternate angles.
x, y, and z form a straight line, therefore their sum is 180 degrees.

21. Page 144

22. Pages