1. This Math Antics video discusses the Pythagorean Theorem. It shows a proof of why this is the case, and gives a few examples, too.
2. This Khan Academy video explains how to find the area of composite shapes. Composite shapes are simply shapes that are made up of other shapes, like a combination of rectangles and circles, triangles, etc. Remember that a common strategy for finding area is to subtract the area around it.
3. This video gives some examples of how to find area of composite shapes.
4. This Khan Academy video shows how to calculate the area of a triangle on a coordinate plane/grid.
5. This Math Antics video explains volume of various shapes and the reasons why those are the volumes.
6. This video explains how to calculate surface area using a net, which is breaking down a 3D object into multiple 2D shapes.
7. This video explains how to calculate the surface area of a cylinder.
8. This detailed video explains how to calculate the surface area of a pyramid by breaking it down into the base and the lateral faces.
9. This video explains how to calculate the volume of a square-based pyramid.
10. This video explains how to calculate the surface area and volume of a cylinder.
11. This video explains how to calculate the volume and surface area of cones.
12. This video shows how to calculate the volume of a sphere.
13. This video shows how to calculate the surface area of a sphere.