Can some one ? !
area of the shaded segment=
the three last pictures are the choices.

Equilateral triangle
A = √3a^2 / 4= √3 6^2 / 4 = 9√3

Circle:
A = π r^2 = 6^2 π = 36π

area of 1/6 circle: 
36π / 6 = 6π

Area of the shaded segment

6π - 9√3 square units

answer is the middle one

1.17+3.99a. you combine the terms with a to create 3.99 and the 1.17 stays because it has no like terms or a variable