List of Formulas for Various Areas
Related article: area area,
measure of the size of a surface region, usually expressed in units that are the square of linear units, e.g., square feet or square meters. In elementary geometry, formulas for the areas of the simple plane figures and the surface areas of simple solids are derived from
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| Plane Figures | Area1 | |
| triangle | ab/2 | |
| parallelogram | ab | |
| rectangle | ab | |
| square | s2 | |
| circle | πr2 | |
| Solids | Total Surface Area1 | |
| right circular cylinder | 2πr(r + a) | |
| right circular cone | πr(r + l) | |
| sphere | 4πr2 | |
1 The abbreviations used are: b = base (length of any side of a plane figure); a = altitude (perpendicular distance from the farthest point of the figure to the extended base); s = side; r = radius (of the base circle in the case of the cylinder or cone); l = slant height (distance from vertex to base of a cone measured on its surface).