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Common Core · High School Geometry · Congruence

Standard G.CO.A.1

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

5 lessons3 worksheets

Lessons for G.CO.A.1

Angles and how to name themReading and writing an angle by its vertex or by three points, with the vertex in the middle.Lesson
Perpendicular linesTwo lines that meet at a right angle.Lesson
Points, lines and planesThe undefined starting objects, and what is built from them.Lesson
Segments, rays and lengthPieces of a line, and adding lengths along one.Lesson
Points, lines and planesPoint, line and plane are accepted without definition so that everything else can be defined from them.Lesson

Printable Worksheets

Angles and how to name them worksheet (PDF)Printable worksheet with answer keyPreview
Perpendicular lines worksheet (PDF)Printable worksheet with answer keyPreview
Points, lines and planes worksheet (PDF)Printable worksheet with answer keyPreview