Triangle?

Geometry Level 2

If $A,B$ and $C$ denotes the angles of a triangle such that $\sin \left( \dfrac A2\right)\sin \left( \dfrac B2\right)\sin \left( \dfrac C2\right) = \dfrac18$ , then triangle $ABC$ is a/an $\text{\_\_\_\_\_\_\_\_\_\_}$ triangle.