An educational illustration depicting various spheres with different sizes scattered on an open book. Each sphere is symmetrically perfect, shimmering under the ambient light. The positions of each sphere indicate the aspect of comparison and evaluation. An abstract visualization of mathematical algorithms swarms a tiny part of the scene, implying the calculation process. The scene doesn't contain any text.

Surface area of spheres practice answers

1. The surface area of a sphere with a radius of 5 cm is 314.16 square cm.

2. The surface area of a sphere with a radius of 7 cm is 615.44 square cm.
3. The surface area of a sphere with a radius of 10 cm is 1256.64 square cm.
4. The surface area of a sphere with a radius of 3.5 cm is 153.86 square cm.
5. The surface area of a sphere with a radius of 12.2 cm is 1862.64 square cm.