Standard 4.MD.5 – Angles

4.MD.5

This standard is usually divided into two parts, A and B.

4.MD.5A: Angle Measurement-An angle is measured with reference to a circle with its center at the common endpoint of the rays, by considering the fraction of the circular arc between the points where the two rays intersect the circle. An angle that turns through 1/360 of a circle is called a “one-degree angle,” and can be used to measure angles.

4.MD.5B: Angles in Degrees-An angle that turns through n one-degree angles is said to have an angle measure of n degrees.

                  Explanation: All this really means is angles are measured in degrees. Students will also learn vocabulary like acute, obtuse, right angles, straight angles, etc. Check out the videos below!