4225 cm^{2}or .4225 m^{2}
[Give credit for answers a little less because of rounded corners.]

difficult

d)

Sarah is right. No additional measurements
are needed.
The dotted line is the diagonal of a square. The diamond can be broken up into 2 triangles, each with base 92 cm and height 46 cm, i.e., 2 × (92 × 46) or 4 triangles with base 46 cm and height 46 cm, i.e., 4 × 1/2 (46 × 46) or area of diamond is 1/2 area of large square, i.e., 1/2 (92 × 92) or area of 2 small
squares, i.e., 46^{2} × 2 or arguments equivalent to these. They all give an area of 4232 cm^{2}, virtually the same as the 4225 cm^{2} above.
NOTE: Students who are familiar with Pythagoras' Theorem could provide an alternative solution. Give credit where appropriate to students who observe that the result is approximate only because the corners are rounded.

difficult

very difficult

This last mark is awarded for correctly stated units in all questions answered.

moderate

NOTE: Do not deduct marks if no units are given. This is allowed for in the final mark above.