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Answer:
C. a = 6 , b = 2√10
Step-by-step explanation:
Similarity triangles so
a/2 = 18/a
a^2 = 36
a = 6
b^2 = 2^2 + 6^2
b^2 = 4 + 36
b^2 = 40
b = 2√10
Answer
a = 6 , b = 2√10