Properties of Quadrilaterals

Each property of a special quadrilateral can be quoted as a reason in your working. In NSW Year 8 maths (NESA outcome MA4‑GEO‑C‑01) the focus is on the diagonals: they bisect each other in a parallelogram, are equal in a rectangle, and cross at right angles and cut the corner angles in half in a rhombus.

You will decide whether statements about quadrilaterals are true or false, halve or double diagonal lengths, and find angles inside the triangles the diagonals make. When two equal lengths are written as expressions, such as \(3y - 2\) and \(y + 10\), you will solve an equation. You will also name the most exact shape you can be sure of, and work with rhombus floor tiles and a garden trellis. It is part of Year 8 Geometry.