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Common Core · Grade 8 · Geometry

Standard 8.G.A.5

Free lessons and printable worksheets aligned to Common Core math standard 8.G.A.5.

5 lessons4 worksheets

Lessons for 8.G.A.5

AA similarityTwo pairs of congruent angles are enough to make two triangles similar.Lesson
Alternate and same side anglesAngles on opposite sides of the transversal and between the two lines.Lesson
Parallel lines and transversalsA line crossing two parallels makes equal and supplementary angle pairs.Lesson
Proving the triangle angle sumDrawing a line through one vertex parallel to the opposite side and reading the angles off it.Lesson
Triangle angle sumThe three angles add to a straight line, and why.Lesson

Printable Worksheets

AA similarity worksheet (PDF)Printable worksheet with answer keyPreview
Alternate and same side angles worksheet (PDF)Printable worksheet with answer keyPreview
Proving the triangle angle sum worksheet (PDF)Printable worksheet with answer keyPreview
Triangle angle sum worksheet (PDF)Printable worksheet with answer keyPreview