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Online Geometry Problem 836: Parallelogram, Perpendicular, Diagonal,
Similarity, Metric Relations. Level: High School,
SAT Prep, College,
Mathematics Education
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The figure below shows a parallelogram ABCD
with AE perpendicular to BC and AF perpendicular to CD. If AE = 4, AB =
5, and AC = 9, find EF.
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