Surface Area of a Sphere

Surface Area of a Sphere is a Grade 8 hands-on derivation of the formula A = 4πr². Students think of surface area as the amount of wrapping needed to cover a sphere, compare that covering with a rectangle whose dimensions are circumference and diameter, and then substitute C = 2πr and d = 2r. The algebra simplifies to 4πr².

Use it as a conceptual geometry lesson when students already know circumference and diameter formulas. The wrapping-paper model gives the surface-area formula a geometric explanation instead of presenting it as something to memorize. Create a free Find a Math Game account to generate teacher-ready lesson support for Surface Area of a Sphere. No credit card is required, with 3 lifetime lesson generations.