Reflectra on Instagram: "Calculating the surface area of a sphere using slicing is a fascinating approach that combines geometry and calculus. By imagining the sphere sliced into infinitely thin circular cross-sections (like stacking coins), you can sum the areas of these slices to find the total surface area. Mathematically, if you take a slice at height y, its radius is \sqrt{r^2 - y^2}, giving a circle area of \pi (r^2 - y^2). Integrating these slices around the sphere using calculus techniqu