We need the exponents law

So if
a=3
b=1/2
then

where x represent every half a year.
Since

, we know that

follows a Poisson distribution with parameter

.
Now assuming

denote the mean and standard deviation of

, respectively, then we know right away that

and

.
So,
Answer: Rectangle, Rhombus, Square
Step-by-step explanation:
I'm sorry but I do not understand your question. It is not specified what you are looking for.
All the angles are different. And It's concave.