A parrelogram
square or rhombus
A rhombus or a parallelogram
A rectangle is a plane figure with four straight sides and four right angles, esp. one with unequal adjacent sides. A square is a plane figure with four equal straight sides and four right angles. A rhombus is a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.
It is not possible for a quadrilateral in Euclidean plane geometry to have no equal angles and still have its opposite sides parallel.It's possible for a quadrilateral to have no equal angles and two of its sides parallel (opposite ones, obviously; adjacent sides can't possibly be parallel). That would be a trapezoid.
a plane figure having six sides is a hexagon
A square is a plane geometric figure having 4 equal sides and 4 right angles.
nothing fits the definition of rhombus and rectangles becauses the definition for rectangle is : a plane figure with four straight sides and FOUR RIGHT ANGLESbut the definition of rhombus is...a parallelogram with ,OPPOSITE EQUAL ACUTE ANGLES and OPPOSITE EQUAL OBTUSE ANGLES, and four equal sides.
opposite angles
The given vertices will form a rhombus when plotted on the Cartesian plane with 4 equal sides of 5 units with 2 equal opposite angles of 143.13 degrees and 2 equal opposite angles of 36.87 degrees including an area of 15 square units.
That's a rhombus. With an additional constraint on the angles, it's also a square.
A square is a plane rectangle with four equal sides and four right angles, a four-sided regular polygon, and a rhombus having four right angles.
Triangle is plane with three sides and three angles. The sum of its inside angles is equal to 180 degrees.