What is the length of BD

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A circle with centre A and radius 12 has a diameter BC. A second circle with diameter AC is drawn. The tangent from B to this circle meets circle centre A at point D. • What is the length of BD? • Taken from the ukmt senior team maths challenge 2017: • https://www.ukmt.org.uk/competitions/... • Thanks for watching. • Don't forget to like and subscribe, and until next time goodbye!

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