Stage: 4 Challenge Level: 
From the measurements and the clue given find the area of the square that is not covered by the triangle and the circle. Give your answer as a formula and then calculate the area correct to two decimal places. (This problem was created by Syed from Foxford School and Community College).
Mixed trig ratios. Cosine rule. Area. Optimisation. Radius (radii) & diameters. Measures - generally. Ruler & protractor constructions. Tangent. Isosceles triangles. Regular polygons.
Published January 2000.
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