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30-11-2016
Mathematics

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The triangle below has a total perimeter of 450 cm:

picture of a triangle with sides 128 and 150. Third side unknown

Write an equation and solve it to find the length of the longest side of the triangle.

Respuesta :

FudgeNames FudgeNames

30-11-2016

equation: 450 = 128 + 150 + n

work:

1st step:
128+150 = 278

2nd step:
450-278 = 172

answer: 172

3rd step (checking) :
450 = 128 + 150 + 172
450 = 278 + 172
450 = 450

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