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Isosceles seven
Is it possible to find the angles in this rather special isosceles triangle?
This task looks at the different turns involved in different Olympic sports as a way of exploring the mathematics of turns and angles.
During the third hour after midnight the hands on a clock point in the same direction (so one hand is over the top of the other). At what time, to the nearest second, does this happen?
Semi-regular tessellations combine two or more different regular polygons to fill the plane. Can you find all the semi-regular tessellations?