Answer:
because it has two parts
Step-by-step explanation:
thats what the first one is
We have been given a diagram and we need to find the value of arc angle a.
According to one of the circle theorems the angle at the centre of a circle is twice the angle at the circumference subtended by the same arc.
Therefore, arc angle a will be twice of the angle at circumference, that is, 34 degrees.
Therefore, value of angle a is:

U would equal 206/86 or 2.39585
The probability of *NOT* getting all 11 tails is 91/100