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Triangular prism has three lateral quadrilateral faces and two parallel triangular bases.

1)  Divide the lateral area by the prism's three lateral faces:
      450 cm² ÷ 3 = 150 cm²

2)  Find the length of the quadrilateral (which is also the side of the triangular base) given the area 150 cm² and height 10 cm:
     150 cm² ÷ 10 cm = 15 cm.

3)  Solve for the perimeter of one of the equilateral triangular bases given the side 15 cm:
    Perimeter = 3 (side)
                     = 3 (15 cm)
                     = 45 cm.

ANSWER:  The perimeter of one of the bases is 45 cm.

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