If the lengths of two sides of an isosceles triangle are 4 cm and 10 cm, then the length of the third side is

1. 4 cm

2. 10 cm

3. 7 cm

4. 14 cm

The length of third side can either be 4 cm or 10 cm.

If the third side is 4 cm then the sides are,

4, 4, 10.

Here, 4 + 4 = 8 < 10.

Since, the sum of two sides of a triangle must be greater than third side hence, these sides are not possible.

Hence, the length of third side is 10 cm.

Hence, Option 2 is the correct option.