This article gives some formulae of some shapes, using words rather than symbols.
Contents
Circle/spherical digon/spherical henagon
Perimeter = π × diameter.Polygons
Perimeter = The sum of the lengths of the sides.Circle/spherical digon/spherical henagon
Area = π × radius2Ellipse
Area = Half of short axis × half of long axis × πTriangle
Equilateral triangle
Area =Right-angled
Area = One leg × the other leg ÷ 2General
Area = Base × height ÷ 2 Numerous other formulas are given hereQuadrilateral
Square
Area = Side2Rectangle
Area = One side × the other sideParallelogram
Area = One side × height from that sideTrapezoid
Area = Sum of the lengths of the parallel sides × height between the parallel sides ÷ 2Kite or other quadrilateral with perpendicular diagonals
Area = One diagonal × the other diagonal ÷ 2Bicentric quadrilateral (with both an incircle and a circumcircle)
Area = Square root of the product of the four sidesRegular polygon
Area = Perimeter × distance from the center to a side ÷ 2Sphere
Surface area = 4 × radius2 × πCone
Surface area = π × (radius of base)2 + π × (radius of base) ++height of coneCylinder
Surface area = 2 × π × radius × height + 2 × π × radius2Regular tetrahedron
Surface area =Square-based pyramid
Surface area = (Side of base)2 + 2 × (side of base) × slant heightCube
Surface area = (Side)2 × 6Regular octahedron
Surface area = 2 ×Sphere
Volume = 4⁄3 × π × radius3Cone
Volume = 1⁄3 × π × (radius of base)2 × heightCylinder
Volume = π × radius2 × heightCube
Volume = Side3Regular cuboid
Volume = The product of the three sidesTesseract
Hypervolund = Side4References
Formulae of shapes Wikipedia(Text) CC BY-SA