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.
Mathematical Sciences>Geometry>Plane>Polygon>Kinds>Quadrilateral
3-Geometry-Plane-Polygon-Kinds-Quadrilateral
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Date Modified: 2022.0224