Предмет: Геометрия, автор: tanyakramers

треугольник абс  прямоугольный угол а=60 угол с= 90CH высота треугольника = 8 смотрезок BK перпендикуляр к плоскости треугольника абс найти отрезок если расстояние от точки K до стороны AC =20 см

Ответы

Автор ответа: MarinkOn
0
8/sin60=x/sin90
8/корень из 3/2=x/1
x=16/корень из 3

 ABC=30=>AC=2AB
BC=корень (AB)^2-корень(AC)^2=>32^2/корень 3-16^2/корень 3=корень 768/корень 3=корень 256=16 

BK=корень CK^2-корень CB^2=корень 400-корень 256=корень 144=12
 ВК= 12
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4. Wear your overcoats in case the weather (12) (turn) ____________ colder. I wonder if it (13) (snow) ____________ as well.

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