This article is a continuation of part 1 on circle theorems and  covers theorems 4 to 7.

RULE 4:  Opposite angles in a CYLIC QUADRILATERAL add to 180°

RULE 5: Alternate segment theorem is found here

RULE 6: A radius and a tangent always meet at a 90° angle

RULE 7: 2 tangent lines originating from the same point are always equal in length

Finding the probability of an Event using Outcomes
Rationalise the Denominator