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Golden Thoughts

Rectangle PQRS has X and Y on the edges. Triangles PQY, YRX and XSP have equal areas. Prove X and Y divide the sides of PQRS in the golden ratio.

From All Corners

Straight lines are drawn from each corner of a square to the mid points of the opposite sides. Express the area of the octagon that is formed at the centre as a fraction of the area of the square.

Star Gazing

Find the ratio of the outer shaded area to the inner area for a six pointed star and an eight pointed star.

Mixing More Paints

Age 14 to 16 Challenge Level:

Take a look at Mixing Paints 

Experiment with different combinations of paints A and B (and paints C and D). 

Different mixes produce paints that are somewhere in between the shades of paints A and B (or paints C and D).