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Titch and Ted are making sandcastles. Ted wants to tell Titch that he doesn't know anything about geometry but just as he begins she points out all the shapes they have learnt about at the beach. Ted makes a cube shaped sandcastle and Titch explains how many faces it has. Then Ted counts the edges of the cube. Next, they count the faces of a pyramid shaped sandcastle. Mr Pie is rather cross when he discovers that they are not selling sweets at the stall but Miss Dotty comes to the rescue.