On coordinate vector-functions of quasiregular mappings

Let $f:R^n \to R^n=R^k\times R^{n-k}$ ($1\leq k\leq n-1$) be a $K$-quasiregular mapping and $\pi: R^n\to R^k$ denotes the canonical projection. Then we obtain a lower estimate for the distortion of the values of generalized angles in $R^k$ under the multy-valued function $F=f^{-1}\circ \pi^{-1}: R^k \to R^n$. This estimate is Möbius invariant and depends only on $K$ and $n$.