Spheres
Read this article and watch the video. Focus on the formulas for surface area and volume.
Then, complete review questions 4, 5, 10, 12, and 13 and check your answers.
Click https://www.ck12.org/c/geometry/surface-area-and-volume-of-spheres/lesson/Spheres-BSC-GEOM/?referrer=concept_details link to open resource.