Given parallel lines the students are to solve for the variable using the properties of parallel lines. The answer to the first variable is entered into the box of the second problem. The students will continue this pattern to enter the answer in the box of the next problem until they reach the end. You have two sets of puzzles to either use them separately or together.You might also be interested in these other geometric activities:Parallelogram Puzzle ActivityQuadrilaterals - Family Tree and C