Mathcounts Formulas

Mathcounts Formulas PERIMETER Triangle p = a + b + c Square p = 4s Rectangle p = 2L + 2W Circle c = 2πr c = πd Regular Polygon p = ns AREA Triangle A = 1/2 bh Square A = s^2 Rectangle A = LW Parallelogram A = bh Trapezoid A = ½(b1 + b2)h Circle A = πr2Regular Polygon A = ½ apOval A = πab (a = height, b = width)LATERAL SURFACE AREARectangular Prism L = (2 l + 2 w)hCircular Cylinder L = 2πrh TOTAL SURFACE AREACube T = 6e2Rectangular Prism T = 2 l w + 2 l h + 2 w hCircular Cylinder T = 2πr2 + 2πrhSphere S = 4πr2 Cone S = πrl (l is the slant height)VOLUMECube V = e3Rectangular Prism V = l w hCircular Cylinder V = π r2hCircle Cone V = 1/3 πr2hPyramid V = 1/3 bhSphere V = 4/3 π r3Regular tetrahedron V = √2s3/12