List of Formulas for Various Areas

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Formulas for Various Areas

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).

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