S(ABСD) = 2 * S(ABC) = 12 * 2 = 24 (см²)
AD = AB + BC + CD = 6,4 + 3/5 + 1/3 = 6 6/15 + 9/15 + 5/15 = 6 20/15 = 7 1/3
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S(ABСD) = 2 * S(ABC) = 12 * 2 = 24 (см²)
AD = AB + BC + CD = 6,4 + 3/5 + 1/3 = 6 6/15 + 9/15 + 5/15 = 6 20/15 = 7 1/3