Today, I am making a triangle-shaped sandbox for my sweet, little Maci. Papa gave me 30' in length of 2"x 4' planks. I would like the longest side to be 12'. What is one possible combination for the o

Today, I am making a triangle-shaped sandbox for my sweet, little Maci. Papa gave me 30' in length of 2"x 4' planks. I would like the longest side to be 12'. What is one possible combination for the other two sides? (show work)