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lenagerasim
@lenagerasim
August 2022
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В треугольнике ABC угол С равен 90 градусов
BC=12, AB=15
Найти: cosA
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motherlode478513
C² = a² + b²
b² = c² - a²
AC² = 15² - 12² = 225 - 144 = 81
AC = √81 = 9
cosA = AC/AB = 9/15 = 3/5
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Answers & Comments
b² = c² - a²
AC² = 15² - 12² = 225 - 144 = 81
AC = √81 = 9
cosA = AC/AB = 9/15 = 3/5