# Triangle perimeter

Calculate the triangle perimeter whose sides are in ratio 3: 5: 7 and the longest side is 17.5 cm long.

Correct result:

o =  37.5 cm

#### Solution:

$c=17.5 \ \text{cm} \ \\ \ \\ x=c / 7=17.5 / 7=\dfrac{ 5 }{ 2 }=2.5 \ \text{cm} \ \\ \ \\ o=(3+5+7) \cdot \ x=(3+5+7) \cdot \ 2.5=\dfrac{ 75 }{ 2 }=37.5 \ \text{cm}$

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