If PN is the perpendicular from a point P on the circumference of a circle of radius 7cm to its diameter AB and the length of the chord PB is 12cm, the length of BN is,

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If PN is the perpendicular from a point P on the circumference of a circle of radius 7cm to its diameter AB and the length of the chord PB is 12cm, the length of BN is,






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