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If perimeter of a triangle is 100 cm and the length of two sides are 30 cm and 40 cm, the length of third side will be:

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80 cm
30 cm
40 cm
None of these

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detailed solution

Correct option is B

Let the length of third side = x cm

Perimeter of triangle = sum of all its sides

100 cm = 30+40+x

100 cm=70+x

x=30 cm

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