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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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a
80 cm
b
30 cm
c
40 cm
d
None of these
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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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