4.GM.1

Identify angles as geometric shapes that are formed where two rays share a common endpoint, understanding that angles are measured with reference to a circle so that an angle that turns through a 1/360 of a circle is called a “one-degree angle” and an angle that turns through 𝑛 one-degree angles is said to have an angle measure of n degree.

Khan Academy Resources

Measuring angles reviewConstructing angles reviewAngle basics reviewAngles in circles word problemsAngle types reviewMeasure anglesAngle typesBenchmark anglesDecompose anglesRecognize angles in figuresTypes of angles by measureEstimate angle measuresDraw anglesAngles in circlesName anglesIdentify parallel and perpendicular linesMeasuring angles using a protractor 2Measuring angles in degreesMeasuring angles using a protractorAngles: introductionAcute, right, & obtuse anglesAngle measurement & circle arcsRecognizing anglesNaming anglesAngles in circles word problem Drawing acute, right and obtuse anglesConstructing anglesMeasuring angles with a circular protractorIdentifying an angleDecomposing angles

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