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Урок 25(4)
Author:
liudmylas
Треугольники АВС и АВD - равнобедренные, причем АС=ВС=15 см, АВ=18 см,
ADB=90
. Найдите косинус угла между плоскостями АВС и АВD, если СD=6 см.
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