ILC 4th Grade Mathematics: Unit 7 Angles and Angle Measurement

This is unit 7 of 9 units. The sequence of units is available in the Read Me First Materials in each unit. 

• Section A: Points, Lines, Segments, Rays and Angles 
  In this section, students will be introduced to some building blocks of geometric figures and the language used to describe them. Students will learn to distinguish points as locations in space, rays as lines that are bounded by one point, and line segments as lines that are bounded by two points. Students will learn to identify parallel lines and angles. 
• Section B: The Size of Angles 
  In this section, students will learn that angles can be measured with degrees as the unit of measurement. Students will learn that angles can be composed and decomposed, which means they are additive. Students will also learn to use a protractor to measure and draw angles. 
• Section C: Angle Analysis 
  In this section, students will continue to draw and analyze angles and reason about their measurements. Students will classify angles by their size and identify acute, obtuse, and straight angles. Students will further develop the idea that angles are additive by composing and decomposing angles, using tactile tools and drawings, and writing expressions or equations to support their reasoning. Students will solve problems about angles in different contexts, both concrete and abstract. Students will use their understanding of right angles and straight angles to reason about unknown angle measurements.