Answer:
10.8
Step-by-step explanation:
By sine rule:

The area of the circle is 18
The distance formula is:

We are given two points in the form (x,y), so plug in the values to the distance formula:

Next we can simplify. We know that 12-12 is 0, so we can drop it from the equation, as it will not affect our answer. Also, we know that -10-15 is -25:

The square and square root cancel each other out leaving us with 25.
The answer is 25.
(5x+2)(8x^2+1) is the answer when factored.