In triangle ABC where BD is the height of a triangle: AE is the bisector of angle A: EF is perpendicular of AC, find EF if BD is 30 cm and AB/AC=7/8

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We have triangle ABC where BD is the height of a triangle: AE is the bisector of angle A: EF is perpendicular of AC, find EF if BD is 30 cm and AB/AC=7/8 enter image description here