How do this math problem? of shaded region shapes

question 2)
find the area of each shape.
All measurements are in centimetres.

and please explain me to how to do this cuz I don't understand my teacher in maths​

Solve the problem. a student earned grades of c, a, b, and a in four different courses. those courses had these corresponding numbers of credit hours: 4, 5, 1, and 5. the grading system assigns quality points to letter grades as follows: a = 4, b = 3, c = 2, d = 1, and f = 0. compute the grade point average (gpa) and round the result to two decimal places. 3.40 3.50 8.75 2.18