The lengths of all four sides of a quadrilateral are integer valued. If three of its sides are of length 1 cm, 2 cm and 4 cm, then the total number of possible lengths of the fourth side is
Sum of the three sides of a quadrilateral is greater than the fourth side.
Therefore, let the fourth side be
1+2+4>d or d<7
1+2+d>4 or d>1
Possible values of d are 2, 3, 4, 5 and 6.
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