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-- each has 4 sides -- each has 4 interior angles -- sum of interior angles of each is 360 degrees -- each is a plane figure -- area of each is (1/2) x (height) x (sum of the lengths of the 2 bases)
it depends general: quadrilateral, polygon only some: trapezoid, parallelogram, rhombus, square, isosceles trapezoid, etc. (i'm pretty sure there's more)
circle, triangle, square, rectangle, rhombus, trapezoid, sphere, cylinder, octagon, etc.
No, if a four-sided figure has equal sides, it is either a rhombus or a square, but not a trapezoid.
Parallelogram, trapezoid, rhombus and a kite are some of them Note that a square and a rectangle have diagonals of equal lengths