INVESTIGATION 1 Option 1: The properties of quadrilaterals


In the diagram below, five types of quadrilaterals have been drawn. Investigate their special properties, paying particular attention to the diagonals, as follows: 1 Begin by measuring their interior angles with your protractor. Identify and mark any pairs of lines which are parallel, as well as any right- angles.


2 Draw the diagonals. Use measurement to determine whether they bisect each other. Mark these on the diagram.


3 Measure the angles between the diagonals. Identify which are perpendicular. Mark diagonals which are perpendicular.


4 Identify the lines of symmetry of the quadrilaterals, if they exist. 5 Use all this information to complete the following table. In the first row, name each quadrilateral using the letters at its vertices.


E A F G Figure 1 J K M N L Figure 3 Figure 4 Q O P U Figure 5 T H D Figure 2 R S C B


Investigation 1: Option 1: The properties of quadrilaterals


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