Ответ:
По теореме косинусов:
AC^2 = AB^2 + BC^2 - 2*AB*BC*cosB.
AC^2 = 25 + 9 - 2*5*3(-sin30); AC^2 = 49; AC=7(cм)
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Ответ:
По теореме косинусов:
AC^2 = AB^2 + BC^2 - 2*AB*BC*cosB.
AC^2 = 25 + 9 - 2*5*3(-sin30); AC^2 = 49; AC=7(cм)