Вопрос школьника по предмету Математика
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Ответ учителя по предмету Математика
Ответ:
18
Пошаговое объяснение:
S = 1/2 AC * BC * sin(a) —
это стандартная формула для нахождения площади, здесь частный случай а = 90, sin(90) = 1, сводим все к S = 1/2 *AC*BC = 4 * 9 / 2 = 18
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