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User Andsens
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Answer:

/BO/=|OC|[Rdius]

AO=2+3=5

considering triangleAOC

AO


{ao}^(2) = {ac}^(2) + {oc}^(2)


{5}^(2) = {3}^(2) + {ac}^(2)


{ac}^(2) = {5}^(2) - {3}^(2)


ac = 4

User Jowen
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