Геометрия
Геометрия, 09.09.2019 15:42, 20Lorans03

Вопрос/Задача:

Измерение прямоугольного параллелепипеда, объём которого равен 81 сантиметров в кубе, уменьшили в три раза. вычислите объём получившегося параллелепипеда.

Ответы на вопрос

Ответ
Ответ разместил: Гость

дуга амв = 360-140=220 град

пусть

6х - дуга ам

5х - дуга мв

6х+5х=220

11х=220

х=20

20*5=100 град - дуга мв

 

угол вам - вписанный, значит он равен половине дуги мв

100: 2=50 град

Ответ
Ответ разместил: Гость

ответ: верны будут 1 и 3

объяснение: это ещё в 7 классе вроде было.

Ответ
Ответ разместил: Гость

ав расположим горизонтально,с -вверху.пусть а> b. проведем срединный перпендикуляр к ав и т-точка пересечения его с вс, ат=тв ,поэтому < cat=< a-< b -дан и треуг. аст строится по 2 сторонам и углу между ними -опорный треугольник! его строим, потом вдоль ст за т. т откладываем тв=b, соединяем а   с в.

Ответ
Ответ разместил: radion2005
K=3 значит v1/v2=k^3 => 81/27=3/ответ 3

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