Help me please please

1. a=3

2. c=8.9

3. c=6.3

4. c=26

5. c=7.8

6. c=17

7. c=10

8. b=15

9. b=10.7

10. a=13.2

11. yes

12. no

13. yes

14. no

15. yes

16. no

step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.

6 on both sides and twelve on the top and the bottom

step-by-step explanation: