Matematika

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mohon di bantuannya ya pake cara
mohon di bantuannya ya pake cara

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  • p1 = 20
    p2 = 28
    p3 = 21
    l1 = 6
    l2 = 21-(6+6) = 9
    l3 = 8

    L1 = p1×l1 = 20×6 = 120
    L2 = p2×l2 = 28×9 = 252
    L3 = p3×l3 = 21×8 = 168
    ---------------------------------- +
    540

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