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Calculation of Area or Perimeter of Quadrilaterals

Source: licencja: CC 0.

Obliczanie pól oraz obwodów czworokątów

Learning objectives

You will communicat in English, developing mathematical, scientific, technical and IT competences, developing learning skills.

You will calculate the perimeter of the area of quadrilaterals.

Learning effect

  • You learn to calculate the area and perimeter of quadrilaterals.

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nagranie abstraktu

Review the formulas to calculate the areaareaarea and the perimeterperimeterperimeter of quadrilaterals. Use the following drawings.

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Source: GroMar, licencja: CC BY 3.0.
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nagranie abstraktu

The aim of the lesson is to calculate quadrilateralquadrilateralquadrilateral areas and perimeters.

Change the position of the vertices of the quadrilateralquadrilateralquadrilateral placed in the applet and calculate its areaareaarea. Write down the appropriate calculation and compare it with the result in the applet. Repeat this procedure two more times.

Think - How to calculate the areaareaarea of a quadrilateralquadrilateralquadrilateral, which is not a trapezoid (thus neither a rectanglerectanglerectangle nor a parallelogramparallelogramparallelogram).

Formulate your conclusions on the basis of the task performed.

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Aplet geogebra: Czworokąt. Poniżej znajduje się galeria będąca wersją alternatywną dla aplikacji.
Source: GroMar, licencja: CC BY 3.0.
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nagranie abstraktu

Conclusions
The areaareaarea of any quadrilateralquadrilateralquadrilateral can be calculated by dividing it into smaller polygons or by supplementing it to larger polygons.

Check yourself by doing the following tasks.

Task 1
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nagranie abstraktu

The squaresquaresquare and the rectanglerectanglerectangle have equal perimeters. The sides of the rectanglerectanglerectangle are 2 cm long and 4 cm long. Calculate the side length of the squaresquaresquare.

Task 2
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nagranie abstraktu

If each side of the parallelogramparallelogramparallelogram is increased by 3, how much will its perimeterperimeterperimeter increase?

Task 3
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nagranie abstraktu

The perimeterperimeterperimeter of a rectanglerectanglerectangle is 20. The length of this rectanglerectanglerectangle is 2 greater than its width. Calculate the areaareaarea of the rectanglerectanglerectangle.

Task 4
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nagranie abstraktu

Maciej has a meadow in the shape of a parallelogramparallelogramparallelogram. One of the sides of this parallelogramparallelogramparallelogram is 40 m long. The height of this side is 25 m. Is the areaareaarea of this meadow more than 1 ha?

Task 5
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nagranie abstraktu

Which trapeziumtrapeziumtrapezium has a larger areaareaarea? How much larger?

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Source: GroMar, licencja: CC BY 3.0.
Task 6
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The areaareaarea of the rectanglerectanglerectangle is equal to the area of the parallelogramparallelogramparallelogram shown in the figure. One of the sides of this rectanglerectanglerectangle is 6 dm long. Calculate the length of the other side.

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Source: GroMar, licencja: CC BY 3.0.
Task 7
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nagranie abstraktu

Task for volunteers
The squaresquaresquare K has a side length of 32. We connect the centres of the sides of this squaresquaresquare. A squaresquaresquare KIndeks dolny 1 is created. We connect the centres of the sides of square KIndeks dolny 1 - a squaresquaresquare KIndeks dolny 2 is created. We proceed in the same way until we get the squaresquaresquare KIndeks dolny 6. Calculate the areaareaarea of the squaresquaresquare KIndeks dolny 6.

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nagranie abstraktu

Remember:

  • The areaareaarea of any quadrilateralquadrilateralquadrilateral can be calculated by dividing it into smaller polygons or by supplementing it to larger polygons.

Exercises

Exercise 1
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Wersja alternatywna ćwiczenia: Determine which sentences are true. Możliwe odpowiedzi: 1. If the height of the trapezium is equal to 10, then the area of this trapezium will always be greater than 5., 2. The perimeter of the rectangle is 10. The area of this rectangle can be equal to 6., 3. Diagonals of a rhombus have lengths of 10 and 6. The area of this rhombus is greater than 30., 4. The diagonal of the square is 4. The area of this square is smaller than 16.
zadanie
Source: GroMar, licencja: CC BY 3.0.
Exercise 2
  1. The perimeter of the square is equal to 12 cm. Calculate the area of this square.

  2. In the isosceles trapezium, the arm has a length of 30 dm. The perimeter is 108 dm. Calculate the sum of the trapezoidal bases.

  3. The diagonals divide a square into 4 triangles - each with the area of 9. Calculate the perimeter of this square.

Exercise 3

Until recently in England, the commonly used units of area measurement were square foot and square inch. Find out about these units of measurement describe them in English.

Exercise 4
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Wersja alternatywna ćwiczenia: Indicate which pairs of expressions or words are translated correctly. Możliwe odpowiedzi: 1. pole - area, 2. obwód - perimeter, 3. prostokąt - rectangle, 4. kwadrat - square, 5. trapez - quadrilateral, 6. czworokąt - parallelogram
zadanie
Source: GroMar, licencja: CC BY 3.0.
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Interaktywna gra, polegająca na łączeniu wyrazów w pary w ciągu jednej minuty. Czas zaczyna upływać wraz z rozpoczęciem gry. Jeden ruch to odkrywanie najpierw jednej potem drugiej karty z wyrazem. Każdy wyraz jest odczytywany. Kolejny ruch to odkrywanie trzeciej i czwartej karty. W ten sposób odsłuchasz wszystkie wyrazy. Nawigacja z poziomu klawiatury za pomocą strzałek, odsłuchiwanie wyrazów enterem lub spacją. Znajdź wszystkie pary wyrazów.
Source: Zespół autorski Politechniki Łódzkiej, licencja: CC BY 3.0.

Glossary

area
area

pole

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wymowa w języku angielskim: area
parallelogram
parallelogram

równoległobok

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wymowa w języku angielskim: parallelogram
perimeter
perimeter

obwód

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wymowa w języku angielskim: perimeter
quadrilateral
quadrilateral

czworokąt

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wymowa w języku angielskim: quadrilateral
rectangle
rectangle

prostokąt

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wymowa w języku angielskim: rectangle
square
square

kwadrat

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wymowa w języku angielskim: square
trapezium
trapezium

trapez

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wymowa w języku angielskim: trapezium

Keywords

areaareaarea

perimeterperimeterperimeter

rectanglerectanglerectangle

trapeziumtrapeziumtrapezium

quadrilateralquadrilateralquadrilateral