Sub-topic 1
2018 · National Preliminary
Free
Testing whether triangle $abc$ is right-angled for $a(-3,-4)$, $b(2,5)$, $c(-5,3)$
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Sub-topic 2
2026 · National Preliminary
Premium
Riddle: quadrant of the cartesian plane
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Sub-topic 3
2026 · National Preliminary
Premium
Checking whether a point satisfies a linear inequality such as $5x-7y\lt 27$ (true/false)
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Sub-topic 4
2013 · National Preliminary
Premium
A point on the x-axis has y-coordinate zero (true/false)
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