Four rods are hinged at their ends to form a quadrilateral. How can you maximise its area?
P is a point inside a square ABCD such that PA= 1, PB = 2 and PC = 3. How big is angle APB ?
Re-arrange the pieces of the puzzle to form a rectangle and then to form an equilateral triangle. Calculate the angles and lengths.
Find lengths in terms of the radii of the two red semicircles.