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Cosa (chi) è parallelogram$57794$ - definizione
MATHEMATICAL THEOREM
Parallelogram identity; Parallelogram equation; Parallelogram rule; Parallelogram equality; Parallelogram Law
Antiparallelogram
QUADRILATERAL WITH TWO PAIRS OF OPPOSITE EQUAL-LENGTH SIDES, THE LONGER TWO OF WHICH ARE CROSSED
Anti-parallelogram; Contraparallelogram
In geometry, an antiparallelogram is a type of self-crossing quadrilateral. Like a parallelogram, an antiparallelogram has two opposite pairs of equal-length sides, but these pairs of sides are not in general parallel.
Parallelogram of force
ADDITION OF VECTORS
Parallelogram of forces; Polygon of force
The parallelogram of forces is a method for solving (or visualizing) the results of applying two forces to an object.
parallelogram
QUADRILATERAL WITH TWO PAIRS OF PARALLEL SIDES
Parallelograms; Parallellogram; Parallelagram; ▱; ▰; Paralellogram; Parallellograms; Paralellograms; Paralelogram; Paralelograms; Parralelogram; Parralelograms; Parralellograms; Parralellogram; Parrallellogram; Parrallellograms; Parrallelograms; Parrallelogram; Parrallelagram; Parrallelagrams; Parrallellagrams; Parrallellagram; Parralellagram; Parralellagrams; Parralelagrams; Parralelagram; Paralelagrams; Paralelagram; Paralellagrams; Parallellagrams; Paralellagram; Parallellagram; Parallelagrams; Area of a parallelogram; Diags. bisect each other; Diags. of //gram; Opp. angles of //gram; Opp. angles equal
[par?'l?l?gram]
¦ noun a four-sided plane rectilinear figure with opposite sides parallel.
Origin
C16: from Fr. parallelogramme, via late L. from Gk parallelogrammon, from parallelos 'alongside another' + gramme 'line'.
Wikipedia
Parallelogram law
In mathematics, the simplest form of the parallelogram law (also called the parallelogram identity) belongs to elementary geometry. It states that the sum of the squares of the lengths of the four sides of a parallelogram equals the sum of the squares of the lengths of the two diagonals. We use these notations for the sides: AB, BC, CD, DA. But since in Euclidean geometry a parallelogram necessarily has opposite sides equal, that is, AB = CD and BC = DA, the law can be stated as
If the parallelogram is a rectangle, the two diagonals are of equal lengths AC = BD, so
and the statement reduces to the Pythagorean theorem. For the general quadrilateral with four sides not necessarily equal, where is the length of the line segment joining the midpoints of the diagonals. It can be seen from the diagram that for a parallelogram, and so the general formula simplifies to the parallelogram law.