  The radiative decay $K^+ \to \pi^+ \pi^0 \gamma$ ($K_{\pi 2 \gamma}$) has
been measured with stopped positive kaons. A $K_{\pi 2 \gamma}$ sample
containing 4k events was analyzed, and the $K_{\pi 2 \gamma}$ branching ratio
of the direct photon emission process was determined to be $[6.1\pm2.5({\rm
stat})\pm1.9({\rm syst})]\times 10^{-6}$. No interference pattern with internal
bremsstrahlung was observed.
