• a/sin A = b/sin B
    13,5/ sin 40 = b/sin 66,6
    b = 13,5 sin 66,6/sin 40
    b = 12,39/sin 40 = 19,27cm

    <C = 180 - 66,6-40 = 73,4°

    luas segitiga
    = 1/2 a b sin C
    = 1/2 * 13,5 * 19,27 sin 73,4
    = 130,07 sin 73,4
    = 124,65 cm²

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