Quadrilaterals are classified into three blocks: parallelograms, trapezoids and trapezoids. The latter have a unique feature : they have no parallel sides. Trapezoid
Characteristics of symmetric trapezoids
They have two pairs of consecutive equal sides. Of these, the first pair of sides is different from the second in that it is smaller than the other. Their diagonals are perpendicular and therefore intersect at the midpoint of one of them. As the term itself implies, they have an axis of symmetry. An example of this category is the deltoid (two isosceles triangles joined together). Trapezoid
Characteristics of asymmetric trapezoids
They do not have consecutive equal sides, as one is bigger than the other. On the other hand, their diagonals are different and oblique (not perpendicular). Likewise, they do not have symmetry axes. It is the only type of quadrilateral that does not have a definite shape, as it can have an infinite number of shapes. Consequently, to calculate its area, it is customary to divide it into familiar figures (for example, two triangles). Trapezoid
one of the bones of the hand
The trapezoid bone is part of the carpus and is located in the wrist along with three other bones: the trapezius, the large bone, and the hamate. All these small bones facilitate the mobility of the fingers of the hand.
The various trapezoids
1) The rectangle trapezoid always has a 90 degree angle. One of its angles is acute (less than 90 degrees) and the other is obtuse (greater than 90 degrees). Consequently, there will always be a smaller base and a larger one.
2) The isosceles trapezoid has two equal sides that are not parallel and two other sides that are parallel. As for the angles, two are acute and two obtuse. The diagonals are of the same measure and therefore are congruent. Lastly, there is a smaller base and a larger base.
3) The scalene trapeze is one in which all sides are different.
They all have one feature in common: they have a parallel relationship between two of their sides, as a minimum.
There are three types of parallelograms: square, diamond and rectangle. Trapezoid
- – The square has four sides and all are the same. Its angles are 90 degrees. The two diagonals are equal and form a right angle of 90 degrees between them.
- – The diamond has all sides equal, but its angles are not straight. Its diagonals are different, one bigger and one smaller.
- – The rectangle is similar to the square (of its four sides, two are short and the other two are long).