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Answer:
1.5 cm
Step-by-step explanation:
The midpoint of OB is 9/2 = 4.5 cm from O
The midpoint of OA is 12/2 = 6.0 cm from O
Since O is not on AB, we must have B on OA, so the distance between midpoints is ...
6 cm -4.5 cm = 1.5 cm . . . . distance between midpoints
