Nebraska Core Academic Content Standards
NE.MA.4.3. GEOMETRY: Students will communicate geometric concepts and measurement concepts using multiple representations to reason, solve problems, and make connections within mathematics and across disciplines.
MA.4.3.1. Characteristics: Students will identify and describe geometric characteristics and create two- and three-dimensional shapes.
MA.4.3.1.a. Recognize angles as geometric shapes that are formed where two rays share a common endpoint.
MA.4.3.1.b. Classify an angle as acute, obtuse, or right.
MA.4.3.1.c. Identify and draw points, lines, line segments, rays, angles, parallel lines, perpendicular lines, and intersecting lines, and recognize them in two-dimensional figures.
MA.4.3.1.e. Identify right triangles.
MA.4.3.1.f. Measure angles in whole number degrees using a protractor.