Missed one corner.
PRIMARY 3 · MATHEMATICS
Angles
Top 5 mistakes
Ranked by how often they appear across 30 MOE-aligned practice questions in our archive.
Straight = 180°.
A pentagon has 5 corners, not 4. Even if some corners are right angles, a regular pentagon has angles of 108° at each corner, not 90°.
A triangle has only 3 corners, not 4. Even if one corner is a right angle, a triangle can never have 4 right angles.
A trapezium has 4 corners but typically only 2 are right angles (in a right trapezium). Not all 4 corners of a trapezium are right angles.
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