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Subject :IMO    Class : Class 10

In the given figure (not drawn to scale), OABC is a quadrilateral with ABC on horizontal ground and O is vertically above A. M is the mid-point of BC. If ∠BAC = 90°, AB = AC = 16 cm and OA = 12 cm, calculate the length of OB.

A25 cm
B15 cm
C20 cm
D28 cm

I don't understand what we are finding. OC or OB clearly angle OAB is 180 degrees,

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