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In the diagram, ST is parallel to UW, < WVT = xo, < VUT = yo, < RSV = 4...



Dicussion (1)

  • xo + zo = 180o (sum of < on str. line)

    45o + zo = 180o

    zo = 180o - 45o

    z = 135o

    z + yo + 20o = 180o (sum of < s in \(\bigtriangleup\))

    135o + yo + 20o = 180o

    yo + 155o = 180o

    yo + 180o - 155o

    yo = 25o

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