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Common Core · High School Geometry · Circles

Standard G.C.A.4

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

2 lessons2 worksheets

Lessons for G.C.A.4

Constructions with circlesTwo perpendicular bisectors locate the circumcenter, which is the center of the circle.Lesson
Proving a tangent is perpendicular to the radiusEvery other point of the tangent line lies outside the circle, so the radius has to be the shortest path.Lesson

Printable Worksheets

Constructions with circles worksheet (PDF)Printable worksheet with answer keyPreview
Proving a tangent is perpendicular to the radius worksheet (PDF)Printable worksheet with answer keyPreview