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HKCEE Questions  (Foreshow)                           

94-22

Answer:

angle ABC = angle PAC = 28 degree   ( angle in alt. sement)

angle BAC = angle BCA = (180 degree - 28 degree) / 2       ( base angle, isos triangle)

so, angle ABC + anglePAB + angle x = 180 degree    (angle sum of triangle)

so, 28 degree + (28+76)degree + x = 180 degree

so,         angle x = 48 degree