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can you send a screenshot
so I can look at the problem to better help you
do you know pythagorean theorem
so
it goes
$a^2$ + $b^2$ = $c^2$
doated
so we are given a and b
a = 7
b = 11
see if 7^2 + 11^2 = 13^2
thats it
yes
um
13 * 13 = 169
no
it has to be exact
pythagorean theorem has to be exact
it is not triangle inequality
yes the answer is no