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worty [1.4K]
2 years ago
7

The triangle below has a total perimeter of 450 cm:

Mathematics
1 answer:
Korvikt [17]2 years ago
3 0
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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