Предмет: Математика, автор: TordLarsssson9436

Знайти кути чотирикутника ,якщо вони пропорційні числам 7,8,9,12.

Ответы

Автор ответа: krateroleg56
0

Ответ:

7x+8x+9x+12x=360 ----> Так як сума кутів чотирикутника дорівнює 360°

36х=360

х=10

Перший кут чотирикутника 7х = 70°

Другий кут чотирикутника 8х = 80°

4-й кут чотирикутника 9х = 90°

5-й кут чотирикутника 12х = 120°

Автор ответа: Natika22
0

Ответ:

70°;  80;   90;  120°

Пошаговое объяснение:

Сумма всех углов четырёхугольника = 360°

7 + 8 + 9 + 12 = 36 частей составляют 4 угла

360 : 36 = 10° составляет 1 часть

10° * 7 = 70° - первый угол

10° * 8 = 80° - второй угол

10° * 9 = 90° - третий угол

10° * 12 = 120° - четвертый угол

--------

70+80+90+120 = 360°

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