Final answer:
The area of triangle EFG is correctly represented by the expression 1/2 × f × e; option 1 is the correct answer according to the standard formula for calculating the area of a triangle.
Step-by-step explanation:
To find the area of triangle EFG, you would use the formula for the area of a triangle, which is 1/2 × base × height. This corresponds to the expression 1/2 × f × e, assuming 'f' is the length of the base and 'e' is the height of the triangle. Therefore, the correct expression that represents the area of triangle EFG is option 1) 1/2 × f × e. For the examples involving calculations of the area in square units provided in the reference material, in each case, we use the formula 1/2 × base × height, and it is important to express the final answer with the proper number of significant figures based on the measurements given.