The document discusses the relationships between area, perimeter, and volume. It defines each term and provides formulas for calculating each. Area is the inside space of a 2D shape, perimeter is the distance around the outline, and volume is the space inside a 3D shape. Perimeter and area are related in that area is inside a shape while perimeter is outside. Volume is calculated using area and can be thought of as area extended into 3 dimensions. Different formulas are provided for calculating the volume of cubes, rectangular prisms, cylinders, cones, and pyramids.