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МатематикаВопрос:
4) AC = 20, BC = 20, <OBC = ? (The figure is a rhombus with diagonals).
Ответ:
In a rhombus, diagonals bisect each other at right angles.
Triangle OBC is a right-angled triangle.
OB = BC/2 = 20/2 = 10.
In triangle OBC, tan(
OC is half of AC, so OC = 20/2 = 10.
tan(
