Proof - Daisy

Proof: The tangent of a circle is perpendicular to its radius at the point of tangency.
1. O is center of circle1. Given
2. AB and AC are tangents2. Given
3. AO = AC3. Radii of circles are always congruent
4. Angle OCB = Angle OAB4. This is the tangent-radius property
5. OCB = OAB5. Hypotenuse Leg Postulate (share hypotenuse)
6. AB = CB6. Corresponding Sides of Congruent Triangles