Stage: 4 Challenge Level: 
The diagram is not drawn to scale.
The areas of the three smaller triangles are shown.
What is the area of the quadrilateral $APOQ$?
Similarity. Area. chemistry. Perimeters. Radius (radii) & diameters. Calculating with ratio & proportion. Long problems. Mixed trig ratios. Inscribed circle. Scale factors.
Published April 2000,June 2010.
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