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The circle C1 circumscribes the triangle...

The circle `C_1` circumscribes the triangle ABC, Tangent to `C_1` at B intersects the side AC (extended) at D. It is given that the centre of `C_1,` is at a distances `10` units from AC with angle `BDC = cos^-1 21/29 and BD = 29.` Then The altitude BN of `Delta ABC` is equal to

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