Втреугольнике abc ab=ac=17 дм и bc=30 дм. к плоскости этого треугольника проведен перпендикуляр ad длиной 6 дм. найти расстояние от точки d до стороны bc

Решение во вложении.

Объяснение:

(4)

по теореме Пифагора

х=√(4²+5²)=√41

(5)

по теореме Пифагора

х=√(8²+7²)=√113

(6)

a=√(x²+h²) //h - это высота треугольника

a²=x²+h²

==> x<a

(7)

x=√(a²+h²) //h - это высота треугольника

x>a

(8)

Найдем сначала AB.

AB=√(6²-4²)=√20 //по теореме Пифагора

AD=Половина AB=(√20)/2=√(20/4)=√5

x=√(6²-AD²)=√(6²-√5²)=√(36-5)=√31

(9)

x=√(1.6-0.6)=√(2.56-0.36)=√2.2

(10)

т.к. треугольник ABC равнобедренный, его боковые стороны равны

т.е. AB=BC

==> AB=7

(11)

т.к. треугольник ABC равнобедренный, его боковые стороны равны

т.е. AB=AC

AB=7

(12)

т.к. треугольник ABC равнобедренный, его боковые стороны равны

т.е. AB=BC

AB=4

the radius of the circumscribed circle is equal to

Объяснение:

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