triangle sides are in the ratio of 5:6:7; perimeter is 234cm; how long is each side

I have to define my variables Write an equation Solve the equation
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3 Answers

triangel rim-leng=234

5+6+7=18

side1=(5/18)*234=65

side2=(6/18)*234=78

side3=(7/18)*234=91
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 triangle sides are in the ratio of 4:5:7; perimeter is 644cm; find the sides.

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I have 65,78, and 91, but I have no idea how to work it out. I know its right cause the teacher gave us all the answers and we just have to figure out how she got that.
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