OK.
Let g(x) = ax²
We have the point (3, 1).
Substitute x = 3 and g(x) = 1:
1 = a(3²)
9a = 1 |divide both sides by 9
a = 1/9
Therefore your answer is

Minor angle, The arc it produces is less than 180 degrees so it is a minor angle
The percent that it rained in April would be 5.4%