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7-41.

Perimeter is the sum of the lengths of all the sides.

Create an expression comparing each side with the shortest side represented by x.

Two Shortest Sides: x
Third Side: 12 + x
Fourth Side: 3x − 9
Perimeter: 117 cm

Shortest Sides: 19 cm
What are the other side lengths?
Be sure to know how to get this length.