4.GR.B: Undersatnd concepts of angle and measure angles.

Undersatnd concepts of angle and measure angles.

4.GR.B.5Identify angles as geometric figures formed by two rays that share a common endpoint and describe angle size as the amount of rotation between the two rays measured in degrees with reference to a circle.4.GR.B.6Measure angles in whole-number degrees using a protractor. Estimate and sketch angles of specified measures.4.GR.B.7Explain that when an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts. Solve addition and subtraction problems to find unknown angles on a diagram in context (e.g., by using an equation with a symbol for the unknown angle measure).

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