M. N is the trisection point of AB, P is the midpoint of Nb, if AB = 12 cm, then PA=______ Cm

As shown in the figure, because m and N are the trisection points of line AB, Nb = 13ab = 4cm. ① when n is near the end of B, P is the midpoint of Nb, so Pb = 12nb = 2, so PA = 12-2 = 10cm. ② when n is near the end of a, P is the midpoint of Nb, so p coincides with m, so PA = 12-4 = 8cm

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