Quadrilaterals: 6th grade math lessons to download in PDF.

A math lesson on quadrilaterals in 6th grade, we will study the definition then the square, the rectangle, the rhombus, the parallelogram. The student should know the definition of a quadrilateral and be able to construct it using geometry equipment (ruler, compass, square and protractor). He will have to master the different particular quadrilaterals like the square, the rectangle, the rhombus or the kite. Master the definitions of diagonals, consecutive sides of a quadrilateral, and opposite sides in the sixth grade.

I. Quadrilaterals

1. vocabulary of quadrilaterals

Definition:

A quadrilateral is a polygon with four sides.

Vocabulary:

For this quadrilateral ABCD :

  • two sides that have no vertex in common are said to be opposite.
  • two sides that have a vertex in common are said to be consecutive.

Coding of a quadrilateral :

Rule:

To name a quadrilateral, we note the vertices in the order in which we meet them when turning in a certain direction. Thus, the quadrilateral below can be written ABCD, ADCB, or BCDA.

quadrilateral

2. particular quadrilaterals

Definition:

A rectangle is a quadrilateral that has four right angles.

Example:

ABCD is a rectangle.

Its opposite sides are parallel and of the same length.

rectangle

Definition:

A rhombus is a quadrilateral that has four sides of equal length.

Example:

ABCD is a rhombus.

diamond

Definition:

A square is a quadrilateral that has four right angles and four sides of equal length.

Example:

The quadrilateral ABCD is a square. Its four angles are right.

Its four sides have the same length: AB=BC=CD=DA.

square

Definition:

A parallelogram is a quadrilateral that has its opposite sides parallel.

Example:

The quadrilateral ABCD is a parallelogram.

Its opposite sides are parallel: (AB)//(DC) and (AD)//(BC).

parallelogram

Consequences:

The square, rectangle and rhombus are particular parallelograms.

Did you get that lesson on quadrilaterals in 6th grade?

Les quadrilatères

Un QCM sur les quadrilatères en 6ème.

Things to remember:

Skills to learn about quadrilaterals:

what to remember

  • Know the definition of a quadrilateral;
  • Know how to draw with geometry equipment (ruler, compass, square and protractor);
  • Know the definitions and properties of the square, the rectangle, the trapezoid.

This course is in accordance with the officialnational education programs.

In addition, you can consult the exercises on quadrilaterals in the sixth grade.

Cette publication est également disponible en : Français (French) العربية (Arabic)

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