Answer:
use Pythagoras theorem a^2 + b^2 = c^2; c is longest side
1) yes
2) no
3) no
Step-by-step explanation:
Take longest and use Pythagoras for each
1) Is 169 equal to 25+144 ?
2) Is 81 equal to 25+49?
3) is 900 equal to 100+144?
