What is the formula of obstructed distance of AB? AC is perpendicular to AB. AC and BC are known distance.

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What is the formula of obstructed distance of AB? AC is perpendicular to AB. AC and BC are known distance.<br><img src='https://www.fatskills.com/images4/BS/surveyor-chain-surveying-52-q.GIF'><br><img src='https://www.fatskills.com/images4/BS/surveyor-chain-surveying-52.GIF'>






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