**This is the students’ version of the page. Log in above for the teachers’ version.**

Prerequisites

## Formulas

\( \text{Surface area of sphere }=4 \pi r^{2} \text{, where }r \text{ is the radius }\)\(\text{of the sphere.}\)- AQA, Edexcel, and OCR will provide this formula in the exam in any relevant questions.

- AQA, Edexcel, and OCR will provide this formula in the exam in any relevant questions.

- You need to
**learn**this formula – or at least understand where it comes from.

# Surface area of cylinders, spheres, and cones

#### Interactive GeoGebra activity

Drag the slider to watch an animation of a cylinder being unfolded into its net. This should help illustrate why the surface area of a cylinder consists of the areas of two circles and a rectangle. With thanks to Tim Brzezinski, whose Unwrapping a cylinder worksheet is available here. Material modified and embedded here under the CC-BY-SA 3.0 license.#### Activity: Do you have enough paint?

In the real world

**Teachers**: log in to view this content.