Sub-topic 1
2026 · National Preliminary
Free
Riddles: parallel lines, perpendicular lines, transversal, vertically opposite angles
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Sub-topic 2
2023 · National Preliminary
Premium
Angle between clock hands at a given hour (true/false)
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Sub-topic 3
2023 · National Preliminary
Premium
Collinearity, coplanarity and perpendicularity of points and segments (true/false)
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Sub-topic 4
2012 · National Preliminary
Premium
Lines parallel or perpendicular to the same line (true/false)
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Sub-topic 5
2013 · National Preliminary
Premium
A straight angle equals two right angles (true/false)
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Sub-topic 6
2013 · National Preliminary
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A reflex angle is larger than an obtuse angle (true/false)
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Sub-topic 7
2013 · National Preliminary
Premium
Complementary angles are both acute (true/false)
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Sub-topic 8
2013 · National Preliminary
Premium
Supplementary angles need not both be obtuse (true/false)
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Sub-topic 9
2013 · National Preliminary
Premium
A right angle measures $90^\circ$ (true/false)
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Sub-topic 10
2013 · National Quarterfinal
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Definitions: parallel, perpendicular, intersecting, skew and concurrent lines, and a transversal
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Sub-topic 11
2013 · National Quarterfinal
Premium
Definitions: straight, right, acute, reflex, full and zero angles
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Sub-topic 12
2013 · National Quarterfinal
Premium
Definitions: obtuse, complementary, supplementary, adjacent, vertically opposite and corresponding angles
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Sub-topic 13
2013 · National Quarterfinal
Premium
Two complementary angles from their sum and difference
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Sub-topic 14
2013 · National Quarterfinal
Premium
Two supplementary angles from their sum and difference
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Sub-topic 15
2013 · National Quarterfinal
Premium
Two supplementary angles from their sum and a ratio
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Sub-topic 16
2013 · National Quarterfinal
Premium
Adjacent angles on a straight line are supplementary (true/false)
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Sub-topic 17
2013 · National Semifinal
Premium
Do three points generally lie on one line? (true/false)
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Sub-topic 18
2013 · National Semifinal
Premium
Do any three points lie in a common plane? (true/false)
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Sub-topic 19
2013 · National Semifinal
Premium
Do two intersecting lines lie in a common plane? (true/false)
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Sub-topic 20
2016 · National Preliminary
Premium
Vertically opposite angles are equal, not supplementary (true/false)
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