1. Warm Up Find the sum of the angles in a polygon with 21 sides
Solve for x: Solve for x: x 2x
145
154 3x
5x - 10 65
165
176

2. p. 327

3. p. 328

4. p. 329

5. pg. 330

6. pg. 331

7. pg. 332

8. pg. 341

9. Try to draw a triangle with sides 2 cm, 2 cm, and 6 cm.

10. 2cm
2cm
6cm
Too short!
What if I tried 3, 3, and 6cm?

11. 3cm
3cm
6cm
Still doesn’t work!

12. pg. 342
The biggest side must be less than the sum of the other sides

13. pg. 343

14. pg. 343

15. pg. 344 *just add the two sides to find the upper bound
and subtract (large – small) to find the lower bound

16. pg. 345

17. pg. 345
pg. 346

18. pg. 346

19. pg. 347