The composite figure is made by: 2 right triangles and 1 semicircle. Or 1 triangle and 1 semicircle. With any of the two combinations of shapes the area is the same.
To find the area you sum the area of each shape that compose the figure:
1 triangle and 1 semicircle:

As the given figure has the diameter of the circle you find the radius as follow:

The base of the triangle is 14m and the height is 10m.

The area of the composite figure is 146.97 square meters