A square has a side length of 5k and an equilateral triangle has a side length of 2k+1. If the perimeter of the square and the triangle is equal, what is the perimeter of the triangle?

Have you tried?

Draw a picture of each figure.

Note the length of each side.

Write a perimeter equation for each figure.

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Do you know the formula for the perimeter of a square and that of an equilateral triangle? You first have to know that to solve your question.