S=1/2 * a*b*sinC
S=1/2 * 12 * 9 * 1/2= 3*9=27
Ответ 27 см²
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S=1/2 * a*b*sinC
S=1/2 * 12 * 9 * 1/2= 3*9=27
Ответ 27 см²