Meet at vertex B — perpendicular, not parallel.
PRIMARY 3 · MATHEMATICS
Geometry
Top 5 mistakes
Ranked by how often they appear across 18 MOE-aligned practice questions in our archive.
Meet at vertex A — perpendicular, not parallel.
BC∥DA is correct, but 'only' is wrong; AB∥CD also.
Counted only the horizontal bars (2) and forgot that each horizontal bar pairs with each vertical bar separately.
Added the number of horizontal bars (2) and vertical bars (2), then subtracted 1, giving 2 + 2 − 1 = 3, instead of multiplying.
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