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Meting

Area (oppervlakte) van poligone

  1. Area van driehoek: 1 2 × basis × loodregte hoogte
  2. Area van trapesium: 1 2 × (som van (parallelle) sye) × loodregte hoogte
  3. Area van parallelogram en rombus: basis × loodregte hoogte
  4. Area van reghoek: lengte × breedte
  5. Area van vierkant: sylengte × sylengte
  6. Area van sirkel: π x radius 2

Khan akademie video oor area en omtrek

Khan akademie video oor area van ʼn sirkel

Vind die area van die volgende figure:

  1. Ons moet eers vir BE, die loodregte hoogte van die parallelogram vind. Ons kan Pythagoras gebruik om dit te doen:
    BE 2 = AB 2 AE 2 BE 2 = 5 2 3 2 BE 2 = 16 BE = 4
  2. Ons pas die formule vir die area van ʼn parallelogram toe om die berekening te doen:
    Area = h × b = 4 × 7 = 28

Poligone

  1. Sê of die bewering WAAR of VALS is in elk van die gevalle hieronder. Indien die bewering vals is, gee ʼn teen-voorbeeld om dit te staaf:
    1. Alle vierkante is reghoeke.
    2. Alle reghoeke is vierkante.
    3. Alle pentagone is gelykvormig.
    4. Alle gelyksydige driehoeke is gelykvormig.
    5. Alle pentagone is kongruent.
    6. Alle gelyksydige driehoeke is kongruent.
  2. Vind die areas vir elk van die gegewe figure. Onthou area word gemeet in vierkante eenhede (cm 2 , m 2 , mm 2 ).

Reghoekige prismas en silinders

In hierdie afdeling leer ons hoe om die oppervlakarea (buite-oppervlakte) en volume van reghoekige prismas en silinders te bereken. ʼn Reghoekige prisma is ʼn veelhoek wat uitgerek word in ʼn kolom sodat die hoogte van die kolom reghoekig tot sy basis is. ʼn Vierkantige prisma het ʼn vierkantige basis en ʼn driehoekige prisma het ʼn driehoekige basis.

Voorbeelde van ʼn vierkantige prisma, ʼn driehoekige prisma en ʼn silinder

Dit is eenvoudig om die oppervlakarea en volume van prismas te bereken.

Oppervlakarea

Die term oppervlakarea verwys na die totale area van die oppervlak aan die buitekant van die prisma. Dit is makliker om te verstaan as ʼn mens aan die prisma dink as ʼn soliede voorwerp.

As jy die prismas in [link] bestudeer, sal jy sien dat die boonste syvlak van die prisma ʼn eenvoudige veelhoek is. Die driehoekige prisma het twee syvlakke wat driehoekig is en drie syvlakke wat reghoekig is. Om die oppervlakarea van ʼn prisma te bereken moet die oppervlak van elke syvlak bereken word en bymekaar getel word. ʼn Silinder bestaan uit twee sirkelvormige syvlakke en ʼn reghoekige kolom.

Oppervlakarea van Prismas

Bereken die area van elke syvlak en tel die areas bymekaar om die oppervlakarea van die prisma te bereken. Bepaal eers wat die regte vorm is van elke syvlak en bereken dan die area van daardie syvlak. Die oppervlakarea van die prisma is gelyk aan die som van die oppervlakareas van al die syvlakke.

Bespreking: oppervlakareas

In pare, bestudeer die volgende prismas saam met die diagram wat langs elke prisma vertoon word en verduidelik watter oppervlakareas elke prisma het. Verduidelik vir jou maat hoe elke diagram verband hou met die gepaardgaande prisma.

Aktiwiteit: oppervlakarea

Soek ʼn prentjie of neem ʼn foto van ʼn gebou wat nie ʼn eenvoudig gedefinieërde vorm het nie (byvoorbeeld een wat nie net ʼn reghoek is nie). Soek vir ʼn kasteel met torings of ʼn huis met gewels of ʼn stoep. Veronderstel jy moet die buitekant van die gebou verf. Hoeveel verf sal jy benodig? Dink aan dit wat jy geleer het omtrent oppervlakarea van poligone. Kan jy reëlmatige poligone in jou prent/foto vind en hulle gebruik om die oppervlakarea te bereken?

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Siyavula textbooks: wiskunde (graad 10) [caps]. OpenStax CNX. Aug 04, 2011 Download for free at http://cnx.org/content/col11328/1.4
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