U.S. National Standards
N.12. Connections to the Grade 4 Focal Points
12.3. Measurement: As part of understanding two-dimensional shapes, students measure and classify angles.
3.1. Analyze characteristics and properties of two- and three-dimensional geometric shapes and develop mathematical arguments about geometric relationships.
3.1.1. Identify, compare, and analyze attributes of two- and three-dimensional shapes and develop vocabulary to describe the attributes.