Points marked on Assembling Objects shapes are specific to where they appear. A point on a CORNER (vertex) means the line must connect AT THAT CORNER — not slightly into one of the adjacent edges. A point in the MIDDLE of an EDGE means the line must connect at the midpoint of that edge — not at one of the corners on that edge. Wrong answers often shift the connection slightly: (a) Line connects on the edge near the corner instead of at the corner; (b) Line connects on the corner instead of mid-edge; (c) Line is offset from the marked location. STRATEGY for corner vs. edge points: when reading the question, NOTE whether each marked point is at a vertex or on an edge. In each answer, check that the line endpoint is at the same anatomical location (vertex or mid-edge). Vertices are easier to verify — they're sharp points and the line either reaches them or doesn't. Edge midpoints require closer inspection — the line should be visibly at the center of the edge, not closer to one end.
Anatomical anchoring: identify each marked point by its anatomical position — 'top vertex,' 'bottom-right vertex,' 'midpoint of left edge,' 'midpoint of top edge near the right corner.' Track that anatomical position regardless of rotation. If the shape is rotated 90°, the 'top vertex' is now somewhere else spatially, but it's still anatomically the 'top vertex' of the original shape — and the line should connect there in the answer.
Common error: looking at the answer's line and matching it spatially without checking whether the rotation has moved the connection to a different anatomical location.
Strategy: trace the marked point on the original. Find the same anatomical location on the answer shape (which may be rotated). Verify the line connects there.