A square has four right angles (90°). Each diagonal splits a corner into two angles of 45°. Note also that the diagonals cut each other in half at right angles. A rectangle has four right angles.

When two lines intersect, the opposite (X) angles are equal. In the diagram above, the two green angles are equal and the two yellow angles are equal.

By solving maths brain teasers you not only improve your mathematical skills but also train your brain to recognise patterns, solve complex problems, and approach challenges from different angles.