In a circle, the internal vertical angles have a formula of

In this case, the formula would be:

We know that whole circle is 12x. And 12x is equal to 360°. When we put that into equation:


If x is 30°:

So, angle 7 is 90°.
For every side you just add 90 to your equation. so #4 would be 360-125-125-55=(55)
Answer:
Lower Quartile is 8 according to the diagram.