trilateral, quadripartite, triangular, tripartite, equilateral triangle, pentagonal, equilateral, asean, partite, triadic, polycentric, conic, troika, bilateral, ellipsoid, semicircles, triangles, dodecahedron, rhombus, isosceles triangle, hexagonal, parallelogram, confederal, interlocking, concentric, geometrical, eap, equidistance, seato, polyhedron, tetrahedrons, ovoid, cuboid, octahedral, plurilateral, symmetrical, concretise, trapezoid, cento, cruciform, antiparallel, hexagon, diarchy, asymmetrical, rhomboids, bipartite, octagons, rectangular, isosceles, concave, calyx, hexagram, centripetal, interflow, axially, delimit, hypotenuse, latitudinal, duumvirate, arcuate, diagonals, concertation, equidistant, elliptic, ideational, quadri, dialogical, transversal, unequals, symmetric, epicondyle, crosspieces, rebus, lunate, oblong, ellipse, quincunx, nato, geostrategic, circular, monistic, triangular prism, architrave, crosshatch, acromion, openwork, tibialis posterior, sextile, twining, longways, westernization, complementation, subspace, fructification, asterism, nebulosity, ovate, neuralgic, laminae, triumphal arch, horizontal, scalene, polygon, triangle, quadrilaterals, rectangle, polygons, pentagon, quadrangle, tetrahedron, abc, parallelograms, square, circle, horseshoe, inclosure, rhomboidal, quadrangular, polygonal, trapezoidal, rhomboid, rhombic, shaped, quadrate, oval, squarish, crescentic, cuboidal, rectilinear

trapezium

corvus, crow, gaff, gaff-headed sail, gaffsail, parallelogram, serratus posterior inferior, serratus posterior superior, shear, tetragonal, trapezium, trapezoid

polygonal shape

four-sided, many-sided, multilateral, tetragon