- https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-area-circumference/e/radius_diameter_and_circumference
- https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-area-circumference/e/area_of_a_circle
- https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-area-circumference/e/area-and-circumference-of-parts-of-circles
- https://www.ixl.com/math/grade-7/surface-area
- https://www.khanacademy.org/math/pre-algebra/measurement/volume-introduction-rectangular/e/volume_1
- https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-slicing-geometric-shapes/e/slicing-3d-figures
- https://www.khanacademy.org/math/basic-geo/basic-geo-volume-surface-area/basic-geo-surface-area/e/surface-area