Choose the correct figure that will complete the given pattern.

Concept

When a figure is completed by reflection, every point keeps the same perpendicular distance from the mirror line while moving to the opposite side. Line endpoints, triangle orientation, and marker positions must all reflect together; the reflected part must not introduce any new symbol.

Application

The left pair reveals the rule, and the same rule can then be applied to the right pair.

1. Compare the upper-left and lower-left quadrants: the lower quadrant is the vertical reflection of the upper one across the central horizontal line. The upright triangle becomes inverted, and the hollow circle moves from the upper-right region to the lower-right region.

2. Reflect the upper-right quadrant in the same way. Its upright triangle must point downward with its vertex at the lower centre; its extra diagonal must run from the upper-left corner toward the right midpoint; and its hollow circle must move from upper-left to lower-left.

3. The unshaded figure with that inverted triangle, that upper-left-to-right-midpoint diagonal, and the hollow circle in the lower-left preserves every reflected feature.

Cross-check

• The figure with the hollow circle in the lower-right region places the marker on the wrong side for the reflected right-hand quadrant.

• The figure made from full crossed diagonals changes the triangle structure instead of reflecting it.

• The upright-triangle figure keeps the original orientation and leaves the circle in the upper-right region.

Result

The completing value is the unshaded inverted-triangle figure with a hollow circle in the lower-left region and an extra diagonal from the upper-left corner toward the right midpoint.