How to Connect Perpendicular Pieces of Cardboard
- 1). Lay one of the pieces of cardboard on a flat surface so the longer sides are vertical. Apply a quarter-sized drop of glue to the center of the cardboard piece.
- 2). Lay the other piece of cardboard on top of the first, placing the longer sides horizontal.
- 3). Place the protractor on the horizontal piece of cardboard. Line up the bottom straight edge of the protractor on the top horizontal edge of the cardboard. The curved part sits over the vertical piece of cardboard. Look at the number where the vertical piece of cardboard intersects the protractor. It should read 90 degrees. If it does not, adjust the piece of cardboard until it does. The glue on the bottom piece is not dry yet, so the cardboard will move.
- 4). Remove the protractor. Wait until the glue dries before moving the cardboard.
