[问答题]
A circle of radius 3 and centre (0,3) is cf2zbjt:+q.a+br1 d4kqy cgj eod 0- 8drawn on an A94su.tmx72prf a;,kj60fnsj , glgje rgand diagram. The tangent to the circle from the point B(0,9) meettju;.24 , jxlp9,em7a rj 0nskg fgs6fs the circle at the point A as shown. Let $w=\overrightarrow{\mathrm{OA}}$
