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°.
Angle 1 is a right angle =90 °
so 5x-85=90
5x=90+85
5x=175
x=35
Option 3 is the equivalent function.
1.04 to the 4th power is 1.1699
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