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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

how do you translate this in Algebraic Expressions
linda Reply
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Shanjida
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
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Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
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Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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