Предмет: Геометрия, автор: livenczovanastya

Дан прямоугольный треугольник АВС. УголС=90градусов. ВС=9, АС=10, нодо найти АВ и sinα и β (здесь нужна теорема Пифагора и таблица Брадиса)

Ответы

Автор ответа: asua2002
0
1)если известны углы..легче

напротив стороны ВС лежит угол в 60 градусов

значит катет АС равен половине гипотенузы АВ..так как он лежит напротив угла в 30 градусов.

отмети гипотенузу как 2х, тогда катет АС = х

по теореме пифагора найдем:

4х² = х² + 36

х = 2√3

сторона АВ = 4√3

сторона АС = 2√3

б) S = ab/2 = 2√3 * 6 /2 = 6√3

в) найдем высоту через площадь:

S = сторона АВ* h/2

6√3 = 4√3*h/2

h = 3
Автор ответа: livenczovanastya
0
Спасибо конечно но мне нудно через теорему Пифагора (с в квадрате = а вквадрате + в в квадрате )
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