Difficulty: Tricky

Jasper had a regular (sides and angles all the same) hexagon with 10-centimetre sides, and 3 regular triangles with 10-centimetre sides. He put the side of a triangle against every second side of the hexagon. How many sides did this final shape have?

Scroll down or click for a hint, or the answer!

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Brainteaser hint

This brainteaser is a lot easier if you try drawing the shape.

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Brainteaser answer

Jasper made an equilateral triangle with 3 sides, each 30-centimetres long!

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