Correct Answer: Option A

Explanation

Line OH divides Line AB into two halves, therefore, Line AH = Line HB = 20cm

Considering \(\triangle\) AOH

(\(\overline{OH})^2\) = 25\(^2\) - 20\(^2\) = 625 - 400 = 225

Taking the square root of both sides 

(\(\overline{OH}\) = \(\sqrt{225}\) = 15 cm

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