We know that the difference of any two sides of a triangle is less than the third side.
So, (AB – AC) must be less than 6 cm.
Options (B), (C) and (D) satisfy the above condition.
When AB – AC = 6.9 cm, the condition doesn’t satisfy.
Ans. The construction of the given ΔABC is not possible when difference of AB and AC is equal to 6.9 cm.
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