# OpenStax-CNX

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# Getallepatrone (Driehoekgetalle)

Module by: Siyavula Uploaders. E-mail the author

## Memorandum

7.

a) 1; 3; 6; 10

b).

c) Skets 5: 15

Skets 6: 21

10 x (10 +1) ÷ 2

= 55

25 x (25 + 1) ÷ 2

= 325

## Inhoud

### AKTIWITEIT: Getallepatrone (Driehoekgetalle) [LO 2.3]

7. Kom ons ondersoek ook DRIEHOEKGETALLE.

• Kyk goed na die volgende:

a) Voltooi nou die tabel:

 Skets 1 2 3 4 Aantal driehoeke

b) Teken nou skets 5 en 6 en vul die tabel verder in.

#### c. Let op?

Ons kan die volgende formule gebruik om die aantal driehoeke in elke skets te bepaal:

Bv. Skets 5 (S5) = 5 × (5 + 1) ÷ 2 = 15

(i) Gebruik die formule en bepaal: (gebruik jou sakrekenaar, indien nodig)

_____________________________________________________________________

_____________________________________________________________________

• die 10de driehoekgetal __________________________________________
• die 25ste driehoekgetal __________________________________________

## Assessering

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 deur die gebruik van:

2.3.3: tabelle.

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