To reinforce the formula for the volume of a cone, I have my students create a cone and cylinder with the same radius and height, I pop a huge bag of popcorn, then we see if 3 cones full of popcorn will fill their cylinder. I could have my students google the process of making a cone with a specific height but it takes awhile so I give them the process. If you have a few days to spend on it, having them come up with the process would be a great way to add rigor to the project. I’ve added my note sheet at the bottom that includes the process and reflection.