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- @seeAlso 2number sequences
- @seeAlso 2number pattern - square number pattern
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- '@animate FibSwordOut,FibWaveSword,FibWaveSword,FibSwordIn
- '@animate FibRaiseRArm,FibWaveRArm,FibWaveRArm,FibWaveRArm,FibLowerRArm,FibRaiseLArm
- '@animate FibRaiseLArm,FibLowerLArm
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- @atGraphic 5,5
- @Picture algebra\a010104a.bmp
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- @PlaySoundFile \a1010401.wav
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- @animate FibRaiseLArm
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- @At 0,5
- #<triangular number pattern#
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- @definition
- @at 50,23
- A triangular number pattern is a special
- @at 10,
- number sequence where each term forms a
- triangle if drawn out as a series of dots.
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- @Wait 5.5
- @animate FibLowerLArm,FibRaiseRArm,FibLowerRArm,FibRaiseRArm,FibLowerRArm
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- @prompt
- @At 10,60
- @keyPoint 9999,triangular numbers
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- @animate FibRaiseRArm,FibWaveRArm,FibLowerRArm
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- The triangular number pattern is:
- @at 15,+4
- 1st term 2nd term 3rd term 4th term 5th term
- 1, 3, 6, 10, 15,
- @Wait 0.5
- @atGraphic 30,115
- @Picture algebra\a010104b.bmp
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- @Wait 0.5
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- @at 10,165
- If we draw out the numbers in the sequence
- you can see that each forms a triangle.
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- @Wait 0.5
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- @animate FibRaiseRArm,FibWaveRArm,FibLowerRArm
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- @PlaySoundFile \a1010402.wav
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- @at ,+4
- Each number included is known as a
- #Btriangular number#.
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- @prompt
- @keyPoint 9999,the rule
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- @animate FibRaiseRArm,FibWaveRArm,FibLowerRArm
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- 1st term 2nd term 3rd term 4th term 5th term
- 1, 3, 6, 10, 15
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- @Wait 0.5
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- @PlaySoundFile \a1010403.wav
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- @at ,+4
- You can see from the numbers in the triangular
- pattern that there is a rule to the pattern.
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- @Wait 0.5
- @at ,+4
- To find the next term find the difference between
- the last two terms, add 1, then add the result to
- the last term.
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- @Wait 0.5
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- @animate FibRaiseRArm,FibWaveRArm,FibLowerRArm
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- @PlaySoundFile \a1010404.wav
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- @at ,+1
- #BChecking the 4th term we have# :
- #^
- @at ,-11
- @Wait 0.5
- #B6# - #B3# = #B3# #t- the difference between the last
- #t two terms
- @Wait 0.5
- #B3# + #B1# = #B4# #t- add 1
- @Wait 0.5
- #B6# + #B4# = #B10# #t- add the result to the last term
- @Wait 0.5
- @at 85,+2
- #BOur rule works#!
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- @prompt
- @keyPoint 9999,summary
- #bSummary#
- @Wait 0.75
- @At ,+15
- * #^A triangular number pattern is one where
- #teach number in the sequence forms a
- #ttriangle if drawn out in a series of dots
- @wait 0.75
- @at ,+15
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- *#tThe triangular number pattern has a
- #tdefinite rule linking each term
- @wait 0.75
- @at ,+15
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- *#tTo find the next term find the difference
- #Tbetween the last two terms, add 1, then
- #Tadd the result to the last term.
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