The lengths of two sides of a triangle are 10 in. and 4 in. What is the length of the third side?

The third side of any triangle would be bigger than positive difference of two sides.

The third side will also be less than the sum.

So if we have 4 and 10.

The third side, x

x > (10 - 4)

x > 6

x < (10 + 4)

x < 14

Third side 6 < x < 14.

The third side is any number that is between 6 and 14.

Note: 6 and 14 are not included.