Answer:
I guess you want to know how many times 9 goes into 780, this would be division. 780/9 =86.6666666667
A isosceles triangle has two sides which are the same. So, we know two of the sides of the triangle are 6 square root 2. (6 square root 2)^2 + ( 6 square root 2) ^2 = (h)^2 -> 72 + 72 = (h)^2 -> 144 = h^2 - > h = 12
Hope this helps! I had to write out square root because I don't have the symbol.