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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 r(r + a)
right circular cone πr(r + l)
sphere r2
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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