Wouldn't it be better if you created a small circular cardboard cave to recede into and enjoy your pie in peace and quiet? This Pi/pie cave is the perfect solution. Make one yourself and be a classroom (or office) "Pi"oneer!
Step 1: Supplies.
2) Duct tape is used to seam pieces together.
3) A box knife separates and shapes segments.
4) String and a marker can be used as a makeshift compass for making perfect circles.
During this step, find someone to bake you a mini pie. Direct them to one of the great instructables on making pie.
Step 2: Support Semi-circles
The string acts as a radius and creates a half circle on the cardboard approximately 3.1415926 times its length.
Math is fun.
If possible, leave a flap of cardboard below. Attach a support brace to the cardboard semi-circle with lots of duct tape.
Step 3: Cave Walls
Put the cardboard on a soft surface and walk on it to break down the rigidity of the cardboard. This will help it to bend to the shape of the semi-circle supports.
More math: The half cylinder walls should be the same height as the half circumference of the supports (if you want the cave to be whole.) Ours is open at the bottom. The net of a cylinder is a circle attached to a same height rectangle. Lots of potential learning in these proportions. Have someone calculate all the sizes and proportions while you eat pie in your cave.
Step 4: Assembly
You will need lots of tape and lots of hands and some patience.
We found that the cave needed a centre support so we used the same sharpie and string to make an identical centre support.
At this point, someone should have baked you a pie to reward your efforts. Stealthily take the pie and hide in your cave to enjoy it away from prying eyes.