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The area of the rectangle and the square

Source: licencja: CC 0.

Pole prostokąta i kwadratu

Learning objectives

You will learn the method for calculating the area of the rectangle and the square.

Learning effect

  • You calculate the rectangle area knowing the length of its sides.

  • You calculate the square area knowing its side length.

  • You use letter symbols to calculate the rectangle or the square areas.

  • You communicate in English to describe the way of calculating the square and the rectangle area.

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nagranie abstraktu

Cut out any two rectangles (a bigger red one and a smaller yellow one). Consider how to determine which one has got the bigger areaareaarea. Using the tracing paper with squares on it, describe how many unit squares each rectangle is made of.

Take the tracing paper with bigger sides of the unit squares than the previous ones. What do you notice?

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nagranie abstraktu

You will find out how to calculate the areaareaarea of the figurefigurefigure by reading the description below:

  • In order to calculate the area of the figurefigurefigure we can divide it into identical unit squares.

  • The number of the identical squares indicates how large the aream8ffa81d0d5384452_1518389034676_0area of the figure is.

  • If we use squares with sidesideside length 1 to measuremeasuremeasure the areaareaarea of a figurefigurefigure, we find out how many unit squares the area of the figurefigurefigure is made of.

In the case of large figures it is very hard to count the squares, so we calculate the areaareaarea of the rectangle according to its dimensions.

Task 1
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nagranie abstraktu

Open the applet and by moving the orange vertices change the dimensions of the rectangle. Notice how much its areaareaarea changes.

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Aplet geogebry: Pole powierzchni prostokąta. Poniżej znajduje się galeria ilustracji stanowiących alternatywę dla apletu.
Source: GroMar, licencja: CC BY 3.0.
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nagranie abstraktu
  • What do you notice?

  • In order to calculate the areaareaarea of a rectangle we multiply its adjacent sides.

  • If the sidesideside lengths are expressed in cm, the areaareaarea is expressed in cmIndeks górny 2.

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nagranie abstraktu

Observe the change of the squaresquaresquare area in relation to its sidesideside length. In order to calculate the areaareaarea of a squaresquaresquare we should squaresquaresquare the length of its sides.

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The square area
Source: epodreczniki.pl, licencja: CC BY 3.0.
Task 2
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nagranie abstraktu

Calculate the areaareaarea of the rectangle with the dimensions 5 by 6.

Task 3
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nagranie abstraktu

Calculate the area of a squaresquaresquare with the sidesideside length of 4.

Task 4
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nagranie abstraktu

Calculate the areaareaarea of the rectangle with sides of a, b :

  1. a = 3 cm, b = 10 cm

  2. a = 8 cm, b = 2 cm

  3. a = 6 cm, b = 6 cm

Task 5
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nagranie abstraktu

Calculate the areaareaarea of a rectanglerectangle rectangle, if one of its sides is 5 centimetres long and the other is:

  1. twice as long;

  2. four times shorter.

Task 6
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nagranie abstraktu

(Advanced) Calculate the sidesideside length of the rectangle knowing that its areaareaarea is 64 cmIndeks górny 2, and its width equals 4 cm.

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nagranie abstraktu
Remember
  • In order to calculate calculate the areaareaarea of a rectangle you should multiply its length by its width.

  • The areaareaarea of a squaresquaresquare equals the square of its sidesideside length.

Task 7
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nagranie abstraktu

(Homework) Look for the dimensions of the football pitch in the Internet and calculate its areaareaarea.

Exercises

Exercise 1
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Source: GroMar, licencja: CC BY 3.0.
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Wersja alternatywna ćwiczenia: Determine which sentences are true. Możliwe odpowiedzi: 1. If the side length of one unit square is 1, then the area of the polygon is greater than 10., 2. If the side length of one unit square is 0,5, then the area of the polygon is less than 5., 3. If the side length of one unit square is 10, then the area of the polygon is 130., 4. If the side length of one unit square is 5, then the area of the polygon is less than 50.
zadanie
Source: GroMar, licencja: CC BY 3.0.
Exercise 2

The room is 6 metres long and 6 metres wide. The other one is 1 meter shorter and 2 meters wider. Calculate the area of each room. What is the difference in the areas of the rooms?

Exercise 3

Calculate the area of a rectangle, if one of its sides is 5 centimetres long and the other is:

  1. twice as long;

  2. four times shorter.

Describe in English the method in which you calculated the area of the rectangle.

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Exercise 4
Wersja alternatywna ćwiczenia: Indicate which pairs of expressions or words are translated correctly. Możliwe odpowiedzi: 1. obliczanie - calculating, 2. miara - measure, 3. kwadrat - square, 4. wymiar - dimension, 5. kwadrat jednostkowy - unit square, 6. prostokąt - figure, 7. figura - rectangle, 8. bok - arm
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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
calculating
calculating

obliczanie

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wymowa w języku angielskim: calculating
dimension
dimension

wymiar

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wymowa w języku angielskim: dimension
figure
figure

figura

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wymowa w języku angielskim: figure
measure
measure

miara

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wymowa w języku angielskim: measure
rectangle
rectangle

prostokąt - czworokąt, który ma wszystkie kąty proste

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wymowa w języku angielskim: rectangle
side
side

bok

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wymowa w języku angielskim: side
square
square

kwadrat – prostokąt, który ma wszystkie boki równej długości

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wymowa w języku angielskim: square
unit square
unit square

kwadrat jednostkowy

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wymowa w języku angielskim: unit square
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m8ffa81d0d5384452_1518389038421_0
m8ffa81d0d5384452_1518389041318_0
m8ffa81d0d5384452_1518389044081_0
m8ffa81d0d5384452_1518389046957_0
m8ffa81d0d5384452_1518389050701_0
m8ffa81d0d5384452_1518389053241_0
m8ffa81d0d5384452_1518389055671_0
m8ffa81d0d5384452_1518389058346_0
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Keywords

areaareaarea

figurefigurefigure

rectanglerectanglerectangle

sidesideside

squaresquaresquare