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Answer:
The answer is C. AAA is not a congruency postulate because the side lengths may be different sizes although the angles are the same.
Answer:
AC ≈ 12.9 cm
Step-by-step explanation:
Using the ratio
sin40° = 
Multiply both sides by 20
20 × sin40° = b, hence
AC = b = 20 × sin40° ≈ 12.9
X= 3/2 you multiply the inverse (9/8) and then you probably know what to do