Which could be the area of the base of the triangular prism?         [not drawn to scale]6 ft210 ft212 ft220 ft2

For this case, the first thing we must observe is that the base of the prism is a triangle.
 The area of the triangle is given by:
 
 Where,
 b: base of the triangle
 h: height of the triangle
 Substituting values we have:
 
 
 The area of the base of the triangular prism could be:
 

The answer is 76° i believe