(b) The diagram below shows a triangle in which the largest angle in the triangle is...

 

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(b) The diagram below shows a triangle in which the largest angle in the triangle is 120° and the length of the longest side is 31. The lengths of the sides of the triangle are consecutive terms of an arithmetic sequence. 31 120° Find the perimeter of the triangle in terms of l. (b) The diagram below shows a triangle in which the largest angle in the triangle is 120° and the length of the longest side is 31. The lengths of the sides of the triangle are consecutive terms of an arithmetic sequence. 31 120° Find the perimeter of the triangle in terms of l.