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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

what does preconceived mean
sammie Reply
physiological Psychology
Nwosu Reply
How can I develope my cognitive domain
Amanyire Reply
why is communication effective
Dakolo Reply
Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
effective communication can lead to improved outcomes in various settings, including personal relationships, business environments, and educational settings. By communicating effectively, individuals can negotiate effectively, solve problems collaboratively, and work towards common goals.
it starts up serve and return practice/assessments.it helps find voice talking therapy also assessments through relaxed conversation.
miss
Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
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Wekolamo
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ARC
A child is a member of community not society elucidate ?
JESSY Reply
Isn't practices worldwide, be it psychology, be it science. isn't much just a false belief of control over something the mind cannot truly comprehend?
Simon Reply
compare and contrast skinner's perspective on personality development on freud
namakula Reply
Skinner skipped the whole unconscious phenomenon and rather emphasized on classical conditioning
war
explain how nature and nurture affect the development and later the productivity of an individual.
Amesalu Reply
nature is an hereditary factor while nurture is an environmental factor which constitute an individual personality. so if an individual's parent has a deviant behavior and was also brought up in an deviant environment, observation of the behavior and the inborn trait we make the individual deviant.
Samuel
I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
Zyryn Reply
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Jonathan
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Jonathan
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Kelu Reply
interpersonal relationships
Abdulfatai Reply
What would be the best educational aid(s) for gifted kids/savants?
Heidi Reply
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Saurabh
What are the treatment for autism?
Magret Reply
hello. autism is a umbrella term. autistic kids have different disorder overlapping. for example. a kid may show symptoms of ADHD and also learning disabilities. before treatment please make sure the kid doesn't have physical disabilities like hearing..vision..speech problem. sometimes these
Jharna
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Jharna
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Jharna
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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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