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Q.

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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a

80 cm

b

40 cm

c

30 cm

d

None of these

answer is B.

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Detailed Solution

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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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