Geometrical terms

The two triangles shown are congruent, and their side lengths are given in centimetres to the nearest $0.1$ cm.

May/June 2015

Ryan states that each diagonal of quadrilateral $Q$ splits it into two congruent isosceles triangles. Draw a ring around every quadrilateral in the list for which Ryan’s statement is always true: Square, Rectangle, Rhombus, Parallelogram, Trapezium, Kite.

May/June 2022

The figure shows a circle with centre $O$. A straight line is touching the circle. Fill in each label with the correct mathematical term. One radius has already been named for you.

May/June 2023

$ABD$ forms an equilateral triangle. $C$ is located on $DB$ and $AC$ is perpendicular to $DB$.

Oct/Nov 2022

Calculate the size of the interior angle of a regular decagon.

Oct/Nov 2025