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Common Core · High School Geometry · Circles

Standard G.C.A.3

Free lessons and printable worksheets aligned to Common Core math standard G.C.A.3.

4 lessons4 worksheets

Lessons for G.C.A.3

Constructions with circlesTwo perpendicular bisectors locate the circumcenter, which is the center of the circle.Lesson
Inscribed polygons and cyclic quadrilateralsA quadrilateral with all four vertices on one circle has opposite angles that add to 180 degrees.Lesson
Proving the inscribed angle theoremHandling the case through the center first, then reaching the others by adding or subtracting.Lesson
Tangent propertiesA tangent line is perpendicular to the radius drawn to the point where it touches.Lesson

Printable Worksheets

Constructions with circles worksheet (PDF)Printable worksheet with answer keyPreview
Inscribed polygons and cyclic quadrilaterals worksheet (PDF)Printable worksheet with answer keyPreview
Proving the inscribed angle theorem worksheet (PDF)Printable worksheet with answer keyPreview
Tangent properties worksheet (PDF)Printable worksheet with answer keyPreview