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Question
6 le périmètre dun triangle équilatéral varie selon la mesure de son côté. représente cette situation à laide dune table de valeurs et dun graphique. trouve ensuite le périmètre dun triangle équilatéral de 67 cm de côté à laide du coefficient de proportionnalité.
périmètre dun triangle équilatéral
mesure dun côté (cm) périmètre (cm)
0 0
4
8
12
16
20
24 67
coefficient de proportionnalité: 2,79
périmètre:
astuce souviens - toi quun triangle équilatéral a trois côtés isométriques.
Step1: Recall perimeter formula
For an equilateral triangle, the perimeter $P$ is related to the side - length $s$ by the formula $P = 3s$. The coefficient of proportionality between the perimeter and the side - length of an equilateral triangle is 3.
Step2: Calculate perimeter for given side - length
Given $s = 67$ cm. Using the formula $P=3s$, we substitute $s = 67$ into the formula: $P=3\times67$.
$P = 201$ cm.
We can also complete the table of values using the formula $P = 3s$:
| Measure of a side (cm) | Perimeter (cm) |
|---|---|
| 4 | $3\times4 = 12$ |
| 8 | $3\times8=24$ |
| 12 | $3\times12 = 36$ |
| 16 | $3\times16=48$ |
| 20 | $3\times20 = 60$ |
| 24 | $3\times24=72$ |
To graph the relationship, we plot the points $(s,P)$ from the table on a coordinate - plane where the $x$ - axis represents the side - length $s$ and the $y$ - axis represents the perimeter $P$. The graph is a straight line passing through the origin with a slope of 3.
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The perimeter of the equilateral triangle with side - length 67 cm is 201 cm. The completed table of values is shown above and the graph is a straight - line with a slope of 3 passing through the origin.