don steward
mathematics teaching 10 ~ 16

Tuesday, 30 November 2010

named quadrilaterals

"I'm thinking of one of these shapes"
[I've written it down, so that I will not be tempted to cheat...]

"you can ask me any questions
but I can only reply yes or no"

you can firmly identify a shape in at most three questions
what would your first question be?
are there alternatives?

can you string the eight special quadrilaterals in a line with just one difference between them?

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