Question 1074668
If not a right angled triangle, then NO HYPOTENUSE.  If the triangle does have a hypotenuse, then it IS a right angled triangle.  



I made a drawing anyway, done on paper not shown here.  A base b, left endpoint connected to your 70 degree angle with a side 7 cm.  Another triangle side opposite the 70 degree angle.  All three angles drawn as acute (which might or might not be a correct assumption).


The unknown base b can be found using  the given area.
{{{(1/2)b*7*sin(70)=42}}}



Once you have found b,  you could use Law Of Cosines to find the length of the side opposite the 70 degree angle.