no 20 besar <ABC adalah A.4° B.36° C.54° d.56°

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  • Kedua sudut mmbntk 90 drjt (siku2)

    15x - 6 + 8x +4 = 90
    23x - 2 = 90
    23x = 90 + 2
    23x = 92
    x = 92/23
    x = 4 drjt

    ABD = 15x - 6
    = 15(4) - 6
    = 60 - 6
    = 54 drjt (C)

  • 90 = 15x - 6 + 8x + 4
    23x = 92
    x = 4

    <ABD
    = 15(4)-6
    = 60 - 6
    = 54°

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