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Wiskunde

Omtrek, oppervlakte en volume

Opvoeders afdeling

Memorandum

a)

(i) 9

(ii) 13

(iii) 16

b)

(i) 9 cm

(ii) 13 cm

(iii) 16 cm

  • oppervlakte van vierkant = lengte

8.

a) 28 m; 45 m 2

b) 6 cm

c) 4 km; 24 km

d) 7 cm; 28 cm 2

e) 11 m; 11 m

9.2

a) 15 000; 1.5

b) 37 500; 3,75

c) 24 000; 2,4

9.3

a) 15 000 000; 15

b) 9 000 000; 9

c) 37 500 000; 37,5

Leerders afdeling

Inhoud

Aktiwiteit: oppervlakte / area [lo 4.2, lo 2.5, lo 2.3]

6. OPPERVLAKTE / AREA

6.1 BELANGRIK om te WEET!

Die oppervlakte (of area) van ’n figuur is die grootte van die plat vlak wat ingesluit word deur die buitelyne van ’n figuur. As jy bv. met jou hand oor hierdie hele bladsy vee, het jy aan die hele oppervlakte van die bladsy gevat. As jy ’n muur verf, noem ons die hoeveelheid ruimte wat jy geverf het, die oppervlakte / area .

6.2 Ook BELANGRIK om te ONTHOU!

Oppervlakte word uitgedruk in vierkante eenhede, bv. vierkante sentimeter (cm²) of vierkante meter (m²).

6.3 Memoriseer die volgende:

1 cm² = 10 mm x 10 mm = 100 mm²

1 m² = 100 cm x 100 cm = 10 000 cm²

1 km² = 1 000 m x 1 000 m = 1 000 000 m²

6.4 Vra jou opvoeder om die volgende bladsy te fotostateer of trek dit net so af.

a) Sny die vierkantjies uit en kyk hoeveel van hulle in die volgende figure sal inpas.

(i)

__________________________________

(ii)

__________________________________

(iii)

__________________________________

b) Wat is die oppervlakte van :

figuur (i)? __________________________________

figuur (ii)? _________________________________

figuur (iii)? _________________________________

6.5.1 Daar is ’n vinniger manier om die oppervlakte van figure te bereken!

Ons kan formules gebruik,

bv. Reghoek = lengte × breedte

= 5 x 2

= 10 cm²

6.5.2 Kan jy ’n formule neerskryf om die oppervlakte van ’n vierkant te bepaal?

_____________________________________________________________________

7. Kan jy twee verskillende reghoeke teken met ’n oppervlakte van 48 cm ² ?

8. Werk saam met ’n maat en voltooi die volgende tabel:

Lengte Breedte Omtrek Oppervlakte
Bv. 5 cm 3 cm 16 cm 15 cm ²
a) 9 m 5 m ________ ________
b) 6 cm ________ 24 cm 36 cm ²
c) 8 km ________ ________ 32 km 2
d) ________ 4 cm 22 cm ________
e) ________ ________ 44 m 121 m ²

9.1 Het jy geweet?

Die oppervlakte van plase word in hektaar ( ha ) gemeet.

1 ha = 100 m x 100 m

= 10 000 m²

9.2 Gebruik jou sakrekenaar en voltooi die volgende tabel:

Lengtem Breedtem Oppervlaktem ² Hektaarha
Bv. 100 100 10 000 1
a) 150 100 ___________ ___________
b) 250 150 ___________ ___________
c) 120 200 ___________ ___________

9.3 Voltooi ook die volgende met behulp van jou sakrekenaar:

Lengtem Breedtem Oppervlaktem ² Oppervlaktekm ²
Bv. 2 000 500 1 000 000 1
a) 5 000 3 000 ___________ ___________
b) 1 500 600 ___________ ___________
c) 7 500 5 000 ___________ ___________

Assessering

Leeruitkomste 4: Die leerder is in staat om gepaste meeteenhede, instrumente en formules in ‘n verskeidenheid kontekste te gebruik.

Assesseringstandaard 4.2: Dit is duidelik wanneer die leerder probleme oplos;

Leeruitkomste 2: Die leerder is in staat om patrone en verwantskappe te herken, te

beskryf en voor te stel en probleme op te los deur algebraïese taal en vaardighede te gebruik.

Assesseringstandaard 2.3: Dit is duidelik wanneer die leerder voorstellings maak van en verwantskappe tussen veranderlikes gebruik sodat inset- en/of uitsetwaardes op ‘n verskeidenheid maniere bepaal kan word;

Assesseringstandaard 2.5: Dit is duidelik wanneer die leerder getalsinne oplos of voltooi deur inspeksie of deur ‘n proses van probeer en verbeter, en die oplossings deur vervanging kontroleer (bv. 2 x - 8 = 4).

Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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Source:  OpenStax, Wiskunde graad 7. OpenStax CNX. Oct 21, 2009 Download for free at http://cnx.org/content/col11076/1.2
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