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2D Regular Polygons:
Equilateral Triangle, Square, Pentagon, Hexagon, Heptagon, Octagon, Nonagon, Decagon, Hendecagon, Dodecagon, N-gon

Other Polygons:
Triangle, Right Triangle, Isosceles Triangle, IR Triangle, Quadrilateral, Rectangle, Rhombus, Parallelogram, Kite, Right Trapezoid, Isosceles Trapezoid, Trapezoid, Cyclic Quadrilateral, Tangential Quadrilateral, Arrowhead, Antiparallelogram, House-Shape, Concave Pentagon, Parallelogon, Threestar, Fourstar, Pentagram, Hexagram, Oktagram, Star of Lakshmi

Round Forms:
Circle, Semicircle, Circular Sector, Circular Segment, Circular Layer, Round Corner, Annulus, Annulus Sector, Ellipse, Elliptical Segment, Stadium, Digon, Spherical Triangle, Reuleaux Triangle, Cycloid, Astroid, Hypocycloid, Cardioid, Parabolic Segment, Arbelos, Salinon, Lune, Oval, Three Circles, Lemniscate, Squircle
3D Platonic Solids:
Tetrahedron, Cube, Octahedron, Dodecahedron, Icosahedron

Archimedean Solids:
Truncated Tetrahedron, Cuboctahedron, Truncated Cube, Truncated Octahedron, Rhombicuboctahedron, Icosidodecahedron, Truncated Dodecahedron, Truncated Icosahedron

Catalan Solids:
Triakis Tetrahedron, Rhombic Dodecahedron, Tetrakis Hexahedron, Deltoidal Icositetrahedron, Rhombic Triacontahedron

Johnson Solids:
Pyramids, Cupolae, Rotunda, Elongated Pyramids, Snub Disphenoid

Other Polyhedrons:
Cuboid, Square Pillar, Square Pyramid, Regular Pyramid, Pyramid, Regular Frustum, Frustum, Bipyramid, Ramp, Right Wedge, Wedge, Rhombohedron, Parallelepiped, Prism, Oblique Prism, Antiprism, Trapezohedron, Disphenoid, Corner, General Tetrahedron, Half Cuboid, Skewed Cuboid, Truncated Rhombohedron, Stellated Octahedron, Small Stellated Dodecahedron, Great Stellated Dodecahedron

Round Forms:
Sphere, Hemisphere, Cylinder, Cut Cylinder, Oblique Cylinder, Generalized Cylinder, Cone, Truncated Cone, Oblique Circular Cone, Elliptic Cone, Spheroid, Ellipsoid, Spherical Sector, Spherical Cap, Spherical Segment, Spherical Wedge, Cylindrical Wedge, Cylindrical Sector, Cylindrical Segment, Spherical Shell, Cylindrical Shell, Spherical Ring, Torus, Arch, Reuleaux-Tetrahedron, Capsule, Lens, Barrel, Paraboloid, Hyperboloid, Oloid, Steinmetz Solids


Trapezoid Calculator

Calculations in a trapezoid. A trapezoid (or trapezium) is a tetragon with two parellel sides. Enter three side lengths and one angle between two of those sides. Choose the number of decimal places and click Calculate. Please enter angles in degrees, here you can convert angle units. Only those trapezoids can be calculated here, where c doesn't overlap a (g1, g2 ≥ 0; α, β ≤ 90°).
Example for a trapezoid: a=4, b=3, c=2.5, β=80°

Carl Friedrich Gauss, by Gottlieb Biermann Longer base (a): Trapezoid, Trapezium
First leg (b):
Shorter base (c):
Second leg (d):
First angle (α):
Second angle (β):
Third angle (γ):
Fourth angle (δ):
Height (h):
First diagonal (e):
Second diagonal (f):
Central median (m):
First overlap (g1):
Second overlap (g2):
Perimeter (p):
Area (A):
Round to    decimal places.

Trapezoid shape:
α + δ = 180°
β + γ = 180°
a = c + g1 + g2
g1 = √ d² - h²
g2 = √ b² - h²
α = arccos( (g1²+d²-h²) / ( 2*g1*d ) )
β = arccos( (g2²+b²-h²) / ( 2*g2*b ) )
h = b * sin(β) = b * sin(γ) = d * sin(α) = d * sin(δ)
e = √ a² + b² - 2ab*cos(β)
f = √ a² + d² - 2ad*cos(α)
m = ( a + c ) / 2
p = a + b + c + d
A = ( a + c ) / 2 * h

Side lengths, height, diagonals and perimeter have the same unit (e.g. meter), the area has this unit squared (e.g. square meter).


Trapezoid, perimeter and area
perimeter p, area A
Trapezoid, sides and angles
sides and angles

Trapezoid, height
Trapezoid, diagonals

Trapezoid, central median
central median



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