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1) 1-ый треугольник равен 2-му треугольнику( по 3 признаку равенства треугольников), следовательно
2) Площадь треугольника равна, полупроизведения основания на высоту проведенную к этому основанию, следовательно
S1 = ah = (4*6)/2=12
Ответ: S=12