smc

In a triangle with sides $a$, $b$, and $c$, where $a\le b\le c$, $△ABC$ is acute if $a^2+b^2>c^2$, right if $a^2+b^2=c^2$, and obtuse if $a^2+b^2<c^2$. If $c$ were equal to $10$, $△ABC$ would be right, as a multiple of the Pythagorean triple $(3,4,5)$. Because $c<10$, $\boxed{\text{the triangle is acute}}$.