This unit is an introduction to angles and angle measurement. Students start this unit drawing points, lines, segments, rays and angles since it is foundational to the other standards in this unit. Students use their understanding of equal partitioning and unit measurement to understand angle and turn measure.
Key Concepts:
 Points, lines, line segments, and rays have specific properties that are maintained when combined to make geometric figures. One of these new figures, an angle, is a geometric figure that is created wherever two rays share a common endpoint.
 An angle is measured in reference to two rays that intersect the center point of a circle. An angle that turns through 1/360th of a circle is called a onedegree angle.
 An angle that turns through n onedegree angles is said to have a measure of 1 degrees.
Lessons

Lesson objective: Understand that angles are geometric figures. Students bring prior knowledge of polygons from 2.G.A.1. This prior knowledge is extended as, in the process of composing and decomposing shapes, students consider geometric building blocks...

Lesson objective: Draw and identify points, lines, line segments, rays, and angles. This lesson helps to build procedural skill with identifying and drawing points, lines, line segments, rays, and angles . This work develops students' understanding that...

Lesson objective: Apply knowledge of points, lines, line segments, rays, and angles to reason about shapes. This lesson provides an opportunity for students to apply their knowledge and understanding of the building blocks of geometry to a mathematical ...

Lesson objective: Understand that the rotatation of 1/360 of a circle is a 1º angle. Students bring prior knowledge of partitioning shapes into equal areas and expressiong those areas as unit fractions of a whole from 3.G.2. This prior knowledge is exte...

Lesson objective: Practice visualizing angle rotation, using the understanding that there are 360 onedegree rotations in a circle. This lesson helps to build procedural skill with understanding and visualizing angle rotation. This work develops student...

Lesson objective: Apply understanding that angles are measured in reference to two rays that intersect the center point of a circle to a reallife situation. This lesson provides an opportunity for students to apply their knowledge and understanding of ...

Lesson objective: Understand that angles are composed of 1º angles. Students bring prior knowledge of unit fractions from 3.NF.1. This prior knowledge is extended to angle measurement as students learn that 1º is equivalent to 1/360 of a circle and that...

Lesson objective: Measure angles to whole number degrees using a protractor. This lesson helps to build procedural skill with measuring angles. A protractor is used here because it is a tool for measuring angles. This work develops students' understandi...

Lesson objective: Construct angles of a specific whole number measure. This lesson helps to build procedural skill with measuring angles. A protractor is used here because it is a tool for measuring and constructing angles. This work develops students' ...

Lesson objective: Apply knowledge of angle construction and measurement to a realworld problem. This lesson provides an opportunity for students to apply their knowledge and understanding of angle measurement to a reallife situation. Students are aske...