Question

how can you decompose the composite figure to determine its area?
as three triangles and a circle
as two triangles, a rectangle, and a circle
as a triangle, a pentagon, and a semicircle
as a triangle, a rectangle, and a semicircle

Explanation:

Looking at the composite figure, we can see the top - most part is a triangle. The middle part (the vertical and horizontal segments that form a sort of 'T' - like structure within the figure) can be considered as a rectangle. The bottom - most part is a semicircle.

Answer:

as a triangle, a rectangle, and a semicircle