(1) When OA is tangent to ⊙M, the distance from point m to straight line OA is 3cm.
∫∠AOB = 30 &； ordm。 The right-angled side facing 30 is half of the hypotenuse.
∴OM=2×3=6cm
According to the topic, when OM < 6 cm and ⊙M intersect OA,
When OM=6cm, ⊙M is tangent to OA,
When om > 6 cm, ⊙M is separated from OA.