A triangle has sides 888, 151515, 171717. Is it a right triangle?
Yes, because 82+152=1728^2 + 15^2 = 17^282+152=172
No, because 8+15≠178+15 \neq 178+15=17
Yes, because all sides differ
No, because 82+152≠1728^2+15^2 \neq 17^282+152=172