In class we were using 3D shapes (i.e cube, rectangular prism, isosceles triangular prism, etc.) and counted the lines of symmetry. When you are counting the lines of symmetry of a 3D object you have to count the lines as if they're like saws cutting through the object. You can see the equality better that way. This is plane of symmetry. When you're looking for lines of symmetry, it's easier to look for two faces that are parallel to eachother.
Towards the end of class we discussed nets of rectangles and cubes. We were given graph paper and were instructed to make a 2x2 cube and a 3x2x1 rectangle. We found that 6s² is the most elegant algebraic expression for surface area of a cube. You multiply 6 by one side (currently represented as s), and you square that because cubes are equal all around. We didn't have enough time to confirm what the proper algebraic expression is for a rectangle, so hopefully we will by tomorrow! :P
Tessellation means tiling, having to do with patterns.
The corner of a shape or figure is called a vertex.
... to study for the test :)
Feel free to comment if I've missed anything. Good luck everyone!