Question 886740
{{{a^2}}}+{{{b^2}}}={{{c^2}}} where A & B are the sides of a right triangle and C is the hypotenuse (the diagonal).
You have 2 of the 3.  Plug them in.
{{{8^2}}}+{{{b^2}}}={{{17^2}
64 + {{{b^2}}} = 289
Subtract 64 from each side
{{{b^2}}} = 225
Take the square root of each side
b = 15
.
The flag is 8 x 15