mathematics formulas

Area of a regular polygon = (1/2) N sin(360°/N) S2

Sum of the interior angles of a polygon = (N - 2) x 180°

number of diagonals in a polygon = 1/2 N(N-3)

number of triangles in a polygon = (N - 2)

acre = (1/640) miles2
mile = 1760 yards = 5280 feet
yard = 3 feet = 36 inches
foot = 12 inches
inch = 2.54 centimeters
liter = 1000 centimeters3 = 1 decimeter3 = (1/1000) meter3