# The perimeter of an isosceles triangle is 28 cm, and the side is 10 cm. Find the base of the triangle.

August 27, 2021 | education

| 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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