Quick Reference ~ A maths Dictionary for Kids by Jenny Eather Email jeather@iprimus.com.au A Maths Dictionary for Kids by Jenny Eather at www.amathsdictionaryforkids.com



• an instrument used to measure angles in degrees.
• protractors may be circular, a full rotation of 360º,
but many are a semi-circle of 180º.
• to measure an angle the crosshairs of the protractor need
to be exactly lined up with the vertex of the angle,
• the vertex is the point where the
two rays of the angle meet.


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