Harry had a circle which was marked with 12 dots so that it could easily be made into a clock face. The circle had a diameter of 10 cm.

Harry drew lines from the 12 to the 3, from the 3 to the 6, from the 6 to the 9, and then back from the 9 to the 12.

What shape had he drawn? Find the area of the shape.

Harry had lots of centimetre square tiles.

He covered as much of his shape as he could with whole tiles without going over the edge.

What was the largest number of whole tiles he could fit in?