11. AA 39/13= 3 14/7 = 2 not similar
12. SSS 15/12=1.25, 12/9= 1.33, 10/7= 1.43 not similar
13. Not similar
14.SSS 50/25= 2, 40/20=2, 20/10=2 similar
15. Exterior angle
16. Vertical angle
17. AA Q=C, B=N similar QBX= CNA by AA
18. SSS 22.5/18=1.25, 15/12=1.25, 18/0=18 Not enough information/ not similar
19.SAS 20/15=1.33, I=S, 15/9= 1.67 not similar
20. SAS 13/12=1.08, S=U, 10/8= 1.25 not similar