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Wiskunde

Graad 4

Ruimte en vorm, patrone, datahantering

Module 14

Ondersoek die oppervlak van veelhoeke

Aktiwiteit 1:

Om die oppervlak van veelhoeke (met behulp van vierkantige roosters en teëls) te ondersoek en skat om 'n begrip van vierkanteenhede te ontwikkel [LU 4.8]

  • Jy besef nou dat wanneer ons tessellasie doen, 'n plat vlak heeltemal bedek word sodat daar geen spasies of oorvleueling is nie.

1. Vierkantige blokke wat deur jou hand bedek word.

1.1 Werk versigtig en plaas jou hand, met vingers oopgesprei, op die geruite deel van die papier hier onder. Trek 'n potloodlyn reg rondom jou hand op die papier, tot by die gewrig. Lig jou hand. Daar sien jy nou jou hand se buitelyn. Wat ons wil doen, is om te sien hoeveel vierkantige blokkies jou hand bedek het.

1.2 Maak 'n kolletjie in elke volledige blokkie soos jy hulle tel, en skryf die totaal volledige blokkies in die tabel op die volgende bladsy. Soek nou al die plekke waar 'n halwe blokkie bedek is. Twee halwe blokkies maak een hele blok. Maak dus 'n kolletjie in elke halwe blokkie en tel hulle as hele blokkies. Skryf die getal neer. Sit nou dié waarvan minder as die helfte bedek is by dié waarvan meer as die helfte bedek is om nog meer hele blokke te maak. Skryf ook hierdie totaal neer. Dit behoort nou vir jou 'n benaderde idee te gee van hoeveel blokkies deur jou hand bedek word.

Vierkantige blokkies wat deur my hand bedek is

Hele blokkies Halwe blokkies wat tot heles gemaak is Ander dele wat tot hele blokke gemaak is Totale getal blokkies wat deur my hand bedek word.

1.3 Kleur nou die vorm van jou hand op die papier in.

2. Tel die aantal vierkantige blokkies wat deur die volgende vorm bedek word op dieselfde manier. Sit dan al die blokkies bymekaar om hele blokke te maak. (Maak kolletjies in die blokkies, terwyl jy tel as dit jou help om dit reg te doen.)

Totale getal vierkantige blokkies wat bedek word:

3. Tel die blokkies wat deur die volgende veelhoeke bedek word:

3. 1 vierkantige blokkies

3.2 vierkantige blokkies

Meet die vierkantige blokkies met jou liniaal. Hulle is 1 cm lank en 1 cm wyd . In plaas daarvan om van "vierkantige blokkies" te praat, kan ons hulle dus VIERKANT SENTIMETERS noem.

4. Vind nou uit hoeveel vierkant sentimeters deur elk van die volgende veelhoeke bedek word:

4.1 _____________ vierkant cm

4.2 _____________ vierkant cm

5. Kom ons maak of jy 'n pophuis vir 'n niggietjie gebou het. Jy het die vloer van die badkamer met papier bedek waarop jy 1 cm vierkantblokkies getrek het. Op die vloer is daar 'n badmatjie, soos hieronder. Hoeveel van die teëls word deur die badmatjie bedek?

  • Verduidelik vir jou maat hoe jy die antwoord bereken het.
  • Skryf neer hoe jy jou antwoord bereken het. Skryf ook jou antwoord neer. Onthou om “vierkant cm” by die antwoord te skryf.

6. In die gesinskamer is daar 'n mat wat 4 m lank en 3 m wyd is.

6.1 Teken 'n diagram om te toon hoe die mat lyk en skryf ook die lengte en die breedte in.

6.2 Bereken hoeveel vierkant meters van die vloer deur die mat bedek word. Skryf jou berekening en die antwoord neer. Onthou om “vierkant meter" by die antwoord te skryf.

Questions & Answers

the diagram of the digestive system
Assiatu Reply
allimentary cannel
Ogenrwot
How does twins formed
William Reply
They formed in two ways first when one sperm and one egg are splited by mitosis or two sperm and two eggs join together
Oluwatobi
what is genetics
Josephine Reply
Genetics is the study of heredity
Misack
how does twins formed?
Misack
What is manual
Hassan Reply
discuss biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles
Joseph Reply
what is biology
Yousuf Reply
the study of living organisms and their interactions with one another and their environments
AI-Robot
the study of living organisms and their interactions with one another and their environment.
Wine
discuss the biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles in an essay form
Joseph Reply
what is the blood cells
Shaker Reply
list any five characteristics of the blood cells
Shaker
lack electricity and its more savely than electronic microscope because its naturally by using of light
Abdullahi Reply
advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
Abdullahi
cell theory state that every organisms composed of one or more cell,cell is the basic unit of life
Abdullahi
is like gone fail us
DENG
cells is the basic structure and functions of all living things
Ramadan
What is classification
ISCONT Reply
is organisms that are similar into groups called tara
Yamosa
in what situation (s) would be the use of a scanning electron microscope be ideal and why?
Kenna Reply
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
Hilary
cell is the building block of life.
Condoleezza Reply
what is cell divisoin?
Aron Reply
Diversity of living thing
ISCONT
what is cell division
Aron Reply
Cell division is the process by which a single cell divides into two or more daughter cells. It is a fundamental process in all living organisms and is essential for growth, development, and reproduction. Cell division can occur through either mitosis or meiosis.
AI-Robot
What is life?
Allison Reply
life is defined as any system capable of performing functions such as eating, metabolizing,excreting,breathing,moving,Growing,reproducing,and responding to external stimuli.
Mohamed
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Source:  OpenStax, Wiskunde graad 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11100/1.1
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