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 cm  x=c/7=17.5/7=52=212=2.5 cm  o=(3+5+7) x=(3+5+7) 2.5=752=3712=752 cm=37.5 cm

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