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Common Core · Grade 4 · Geometry

Standard 4.G.A.1

Free lessons and printable worksheets aligned to Common Core math standard 4.G.A.1.

5 lessons4 worksheets

Lessons for 4.G.A.1

Acute, right, obtuse and straight anglesAngles sorted by size, from smaller than a square corner up to a full half turn.Lesson
Parallel linesTwo lines in a flat plane that never meet, however far they go, are parallel.Lesson
Perpendicular linesTwo lines that meet at a right angle.Lesson
Points, lines, rays and segmentsA line goes on forever both ways, a ray goes on one way from an endpoint, and a segment stops at two endpoints.Lesson
Segments, rays and lengthPieces of a line, and adding lengths along one.Lesson

Printable Worksheets

Acute, right, obtuse and straight angles worksheet (PDF)Printable worksheet with answer keyPreview
Parallel lines worksheet (PDF)Printable worksheet with answer keyPreview
Perpendicular lines worksheet (PDF)Printable worksheet with answer keyPreview
Points, lines, rays and segments worksheet (PDF)Printable worksheet with answer keyPreview