Let the perpedicular, p=4.2 m and base is b m, hypotenuse is h m.
Then by the given question, h-b=14⇒h=b+14
Then by Pythagoros's theorem,
Since any side of a triangle can't be negative that means the datas given are wrong.
. I think 4.2 m is not the right length because if you add any two sides of a triangle, it should be greater than the third side.
Here 4.2+(hypotenuse-14)=hypotenuse-9.8 which is shorter than the hypotenuse.
It probably reads 42.
Let x=length of the other side, then
Apply Pythagoras theorem:
42²+x² = (x+14)²
Expand the right-hand side:
which gives x=56