Answer:
The sum of the interior angles of any triangle is equal to 180 degrees.


you can check in your calculator.
anyhow, to get the "recurring decimal to fraction", you start by setting to some variable, "x" in this case, then move the repeating part to the left of the point by multiplying it by some power of 10, and then do the equating.
8 over 20 equals 6 over 15
The answer would be 6w^5y^3