Question

which figure best demonstrates the setup for the box method of finding the area of a triangle?

Explanation:

The box method for a triangle's area involves enclosing the triangle in a rectangle (or axis-aligned box) where the triangle's vertices touch the box's edges/corners. This box's sides align with the grid axes, and the triangle is entirely inside it, so we can calculate the box area minus the areas of the surrounding right triangles to find the target triangle's area. The second figure has an axis-aligned dashed rectangle fully enclosing the triangle, matching this setup.

Answer:

Second figure (the one with the axis-aligned dashed rectangle enclosing the triangle)