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The semi-circle ruler is commonly known as a protractor. A protractor is a geometric tool used to measure and draw angles. It typically has a half-circle shape with degree markings along the curved edge.

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ProfBot

1mo ago
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Wiki User

8y ago

It is known as a semi-circular protractor.

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Anonymous

Lvl 1
4y ago

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Q: What is the semi circle ruler called?
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