Word Origin & History. epicene mid-15c., originally a grammatical term for nouns that may denote either gender, from L. epicoenus common, from Gk. Extended sense of characteristic of both sexes first recorded in English c.1600; that of effeminate 1630s.
A parallelogram is a quadrilateral with two pairs of parallel sides. Equivalent conditions are that opposite sides are of equal length; that opposite angles are equal; or that the diagonals bisect each other. Parallelograms also include the square, rectangle, rhombus and rhomboid. Rectangle: all four angles are right angles. 2  An equivalent condition is that the diagonals bisect each other and are equal in length. 3  Informally: a box or oblong (including a square). 4  Square (regular quadrilateral): all four sides are of equal length (equilateral), and all four angles are right angles.
The number of sides; The interior angles (the angles inside). The length of the sides. These properties help use to remember which shapes are which and why they so called (in some cases). Let us look at shapes that have 4 sides Quadrilaterals (Quad- means 4). Quadrilaterals ALWAYS have 4 sides. The interior angles of a quadrilateral add up to 360 degrees. Here are the quadrilaterals you are expected to know about. Square; Rhombus; Rectangle; Parallelogram; Trapezium; Kite; That does not seem to many does it. Let us look at the properties of quadrilaterals. Square. A square has got 4 sides of equal length and 4 right angles (right angle = 90 degrees).