Let an isosceles triangle ABC be given, with sides AB and BC and the base AC. By the condition of the problem, AB = 10 cm.
1) Find the side of the BC:
Since the triangle ABC is isosceles, it means AB = BC = 10 cm.
2) Find the base of the AC, based on the perimeter of the triangle (ABC = 28 cm):
AC = 28 -10 -10 = 8 (cm).
Answer: AC base = 8 cm.
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