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ESERCIZIO 1
Punto 1
Per calcolare l’angolo iniziale di partenza
rispetto all’asse delle ascisse bisogna
ricavare il coefficiente angolare (m), del
segmento AB, dalla formula riportata sopra
Il coefficiente angolare è
-1, equivalente a 135°
Punto2 Per calcolare il tempo
che impiega il giardiniere
bisogna prima calcolare
l’area del poligono,
esaminando dal grafico
gli ulteriori poligoni
ottenibili da quello di
base
Una volta ricavata l’area
totale del poligono
(30.000 mq), tramite la
proporzione riportata
nella foto è possibile
ricavare il. tempo
impiegato (t)
Il grafico
Punto 3
Per calcolare il numero di betulle
da piantare lungo il perimetro del
giardino occorre, appunto,
calcolare il perimetro del
poligono
Per calcolare il perimetro
prima calcoliamo la
lunghezza dei lati
tramite la formula
riportata in foto
Infine per moltiplichiamo
il numero delle betulle
(336) per il loro costo,
ricavando il costo totale
(1512 €)
Punto 3
■ Andando a misurare direttamente a misurare dalla foto notiamo che 1 cm
equivale a 50 m, quindi:
■ AB=3cm
■ BC=2cm
■ DC=7cm
■ DA =4,3cm
P=3cm+2,3cm+7cm+4,5cm=16,8cm
P=16,8cm*50000cm=840m
Punto 4
Per calcolare la posizione della
fontana, quindi quella de
baricentro, utilizziamo la formula
riportata in foto
Una volta trovate le coordinate
del baricentro, siamo a
conoscenza della posizione della
fontana
ESERCIZIO 2
Procedimento
Le 3 tariffe possono essere
scritte anche sotto forma di
equazioni
Per trovare le tariffe più convenienti
nel vari casi possiamo mettere a
sistema le varie equazioni ricavate in
precedenza
Prendiamo in considerazione i valori delle
x, da ciò possiamo dire:
- Da x=0 a x=57,1 conviene la tariffa B
- Da x=57,1 a x=83,3 conviene la tariffa A
- Da x=83,3 a x=120 conviene la tariffa A
- Da x=120 a x=200 conviene la tariffa C
Il grafico

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Presentazione matematica volpe nunin[679]

  • 2. Punto 1 Per calcolare l’angolo iniziale di partenza rispetto all’asse delle ascisse bisogna ricavare il coefficiente angolare (m), del segmento AB, dalla formula riportata sopra Il coefficiente angolare è -1, equivalente a 135°
  • 3. Punto2 Per calcolare il tempo che impiega il giardiniere bisogna prima calcolare l’area del poligono, esaminando dal grafico gli ulteriori poligoni ottenibili da quello di base Una volta ricavata l’area totale del poligono (30.000 mq), tramite la proporzione riportata nella foto è possibile ricavare il. tempo impiegato (t)
  • 5. Punto 3 Per calcolare il numero di betulle da piantare lungo il perimetro del giardino occorre, appunto, calcolare il perimetro del poligono Per calcolare il perimetro prima calcoliamo la lunghezza dei lati tramite la formula riportata in foto Infine per moltiplichiamo il numero delle betulle (336) per il loro costo, ricavando il costo totale (1512 €)
  • 6. Punto 3 ■ Andando a misurare direttamente a misurare dalla foto notiamo che 1 cm equivale a 50 m, quindi: ■ AB=3cm ■ BC=2cm ■ DC=7cm ■ DA =4,3cm P=3cm+2,3cm+7cm+4,5cm=16,8cm P=16,8cm*50000cm=840m
  • 7. Punto 4 Per calcolare la posizione della fontana, quindi quella de baricentro, utilizziamo la formula riportata in foto Una volta trovate le coordinate del baricentro, siamo a conoscenza della posizione della fontana
  • 9. Procedimento Le 3 tariffe possono essere scritte anche sotto forma di equazioni
  • 10. Per trovare le tariffe più convenienti nel vari casi possiamo mettere a sistema le varie equazioni ricavate in precedenza Prendiamo in considerazione i valori delle x, da ciò possiamo dire: - Da x=0 a x=57,1 conviene la tariffa B - Da x=57,1 a x=83,3 conviene la tariffa A - Da x=83,3 a x=120 conviene la tariffa A - Da x=120 a x=200 conviene la tariffa C