You have two boards that will make up the two sides of the triangular sandbox. One is 5 ft and the other is 8 ft. Boards will come in the length 15, 12, 8, 5, and 2. Which boards can you use for the third side of the sandbox?[br][br]Use the sliders to create the 3rd length. Then try to see if you can form a closed triangular sandbox.