Lessons for G.CO.D.12
Copying a segment and an angleSetting the compass to a given length and marking that same length on a new ray.Lesson
Perpendicular and parallel lines through a pointMarking equal distances either side of the point and then bisecting the segment between them.Lesson
Bisecting a segment and an angleTwo equal arcs from the endpoints cross on the perpendicular bisector, which also locates the midpoint.Lesson
Compass and straightedge constructionsCopy a segment, bisect an angle, drop a perpendicular, with no ruler markings.Lesson
Why a construction worksEvery compass and straightedge step can be defended by the congruent triangles or circles it creates.Lesson
Printable Worksheets
Copying a segment and an angle worksheet (PDF)Printable worksheet with answer keyPreview
Perpendicular and parallel lines through a point worksheet (PDF)Printable worksheet with answer keyPreview
Bisecting a segment and an angle worksheet (PDF)Printable worksheet with answer keyPreview
Why a construction works worksheet (PDF)Printable worksheet with answer keyPreview