Figures {quadrilateral}| can have four sides. Quadrilaterals {cyclic quadrilateral} can have all four vertices on a circle.
area: parallelogram
Parallelogram area = b * a * sin(A), where a and b are side lengths and A is angle between them.
area: rectangle
Rectangle area = l*h, where l and h are side lengths.
area: rhombus
Rhombus area = s * s * sin(A), where s is side length and A is small angle.
area: square
Square area = s^2, where s is side length.
area: trapezoid
Trapezoid area = a * sin(A) * (b1 + b2) / 2, where a is vertical-side length, A is small angle between side and base, and b1 and b2 are bases. Trapezoid area = h * (b1 + b2) / 2, where h is height and b1 and b2 are bases.
perimeter: rectangle
Rectangle perimeter = 2*a + 2*b, where a and b are side lengths.
perimeter: rhombus
Rhombus perimeter = 4*s, where s is side length.
perimeter: square
Square perimeter = 4*s, where s is side length.
perimeter: trapezoid
Trapezoid perimeter = a + b + c + d, where a, b, c, d are side lengths.
perimeter: parallelogram
Parallelogram perimeter = 2*a + 2*b, where a and b are side lengths.
Figures {quadrangle}| can have four vertices. Quadrangles {simple quadrangle} can have four vertices and four lines, with no diagonals. Quadrangles {complete quadrangle} can have four points, four lines, and two diagonals.
Diamond-shaped quadrilaterals {kite} can have two equal-side pairs and two equal-angle pairs. Diagonals are perpendicular.
Figures {parallelogram}| can have two pairs of equal, opposite, and parallel sides.
Figures {rectangle} can have two pairs of equal and opposite sides at right angles.
Figures {rhombus}| {rhom} can have four equal sides.
Figures {square figure} can have four equal sides at right angles.
Figures {trapezoid}| {trapezium} can have only one pair of parallel opposite sides.
Quadrilaterals {skew quadrilateral} can have four points not in same plane.
3-Geometry-Plane-Polygon-Kinds
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0225