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Wiskunde

Ruimte en vorm

Opvoeders afdeling

Memorandum

15.2 (a) konkaaf

  1. konkaaf
  2. konveks

16.1 (a) ruit

(b) trapesium

(c) oktogoon (8-hoek)

(d) vierhoek

veelhoek

(e) heksagoon (6-hoek)

(f) heptagoon (7-hoek)

(g) pentagoon (5-hoek)

(h) parallelogram

16.2

16.3 108°

17.1 OOREENKOMSTE

* 4 ewe lang sye

sye

* hoeklyne halveer mekaar

  • 4 hoeke

VERSKILLE

* ruit se hoeke nie 90° nie

17.2 OOREENKOMSTE

* het 2 pare ewe lang sye

* 2 teenoorstaande sye is ewe lank /

* het 4 hoeke

* hoeklyne halveer mekaar /

VERSKILLE

* parallelogram se hoeke nie 90 ° nie/

18.

(a) vlieër

(b) trapesium

20.2 plafonne; hekke; dakkappe; brûe; steierwerk

Leerders afdeling

Inhoud

Aktiwiteit: veelhoeke [lu 3.1, lu 2.3]

15. VEELHOEKE

15.1 Het jy geweet?

Meetkundige vorms wat deur reguit lyne omsluit word, noem ons veelhoeke . Dit bestaan uit sye , hoeke en hoekpunte .

15.2 Het jy ook geweet?

’n Veelhoek is konveks as al die lyne wat enige twee hoekpunte verbind binne die veelhoek val.

Al die binnehoeke is skerp- of stomp-hoeke.

As enige lyn wat twee hoekpunte verbind buite ’n veelhoek val, is die veelhoek konkaaf.

Een of meer van die binnehoeke is ’n inspringende hoek.

15.2.1 Is die volgende veelhoeke konveks of konkaaf?

a)

_________________________________

b)

_________________________________

c)

_________________________________

15.3 Onthou ook!

’n Reëlmatige veelhoek se sye is almal ewe lank en die hoeke is almal ewe groot.

Hoe meer sye ’n reëlmatige veelhoek het, hoe groter is sy binnehoeke.

’n Onreëlmatige veelhoek se sye is almal verskillende lengtes.

15.4 LET WEL!

Ons kan die grootte van die hoeke van ’n reëlmatige veelhoek met behulp van ’n formule bereken:

Grootte van elke hoek =
(aantal sye – 2) × 180°
aantal sye

bv. Seshoek:

16.1 Werk saam met ’n maat. Kan julle sê wat elkeen van die volgende veelhoeke genoem word? Skryf die naam binne-in elke figuur.

a)

b)

c)

d)

e)

f)

g)

h)

16.2 Bereken die grootte van elke hoek van die aghoek (oktogoon)

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

16.3 Wat is die grootte van elke hoek van ’n vyfhoek? (pentagoon)

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

17.1 Werk in groepe van drie. Sny stroke van stewige karton of gebruik roomys-stokkies. Maak gaatjies op die punte en heg die stroke met splitpennetjies. Bou ’n vierkant.

Vergelyk nou die vierkant met die ruit en kyk of julle die volgende kan voltooi:

  • Druk op die hoekpunt en verander dit in ’n ruit:

OOREENKOMSTE

tussen ruit en vierkant

_____________________________________________________________________

Questions & Answers

Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
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
what is the k.e before it land
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
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 7. OpenStax CNX. Oct 21, 2009 Download for free at http://cnx.org/content/col11076/1.2
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