CCSS.Math.Content.4.G.A
The standard
Draw and identify lines and angles, and classify shapes by properties of their lines and angles.
Common Core State Standards for Mathematics
What this standard means
Students need to recognize and draw points, lines, line segments, rays, and angles. They also need to name right, acute, and obtuse angles, and use these features to describe shapes. They should sort triangles, quadrilaterals, and other polygons by parallel sides, perpendicular sides, and angle types.
Mastery looks like using geometry words to justify a classification, not just naming a shape by appearance. Students often mix up rays and line segments, think a tilted right angle is not right, or classify shapes by size or direction instead of properties.
Ways to teach it
- Give students straws and twist ties to build shapes, then label parallel sides, perpendicular sides, and angle types with sticky notes.
- Ask students to explain, “Can a shape have both parallel sides and a right angle?” using a sketch and two geometry words.
- Show five drawn shapes and ask students to circle one acute angle, mark parallel sides, and write one property-based shape name.
- Have students photograph or sketch classroom objects, then label lines, rays, angles, parallel sides, and perpendicular sides they can find.
Plan a lesson for CCSS.Math.Content.4.G.A
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Related standards
- CCSS.Math.Content.2.G.A.1
Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces. Identify triangles, quadrilaterals, pe...
- CCSS.Math.Content.7.G.A
Draw, construct, and describe geometrical figures and describe the relationships between them.
- CCSS.Math.Content.4.G.A.1
Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.
- CCSS.Math.Content.4.G.A.2
Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. ...