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There are 2 NRICH Mathematical resources connected to Ruler, you may find related items under Mathematics Tools.

Broad Topics > Mathematics Tools > Ruler

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Dotty Relationship

Age 7 to 11 Challenge Level:

Can you draw perpendicular lines without using a protractor? Investigate how this is possible.

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Yin Yang

Age 7 to 11 Challenge Level:

Can you reproduce the Yin Yang symbol using a pair of compasses?