Geometry: Lines, Angles, and Polygons

Undefined terms: point, line, plane

Defined terms: segment, ray, angle

Measuring segments and angles

Angle classifications: acute, right, obtuse, straight

Angle pairs: complementary and supplementary

Angle pairs: vertical angles

Angle pairs: linear pairs

Parallel lines and transversals

Corresponding angles

Alternate interior and exterior angles

Same-side interior angles

Proving lines parallel

Perpendicular lines

Polygons: definition and classification

Triangles: classification by sides

Triangles: classification by angles

Triangle angle sum theorem

Exterior angle theorem

Triangle inequality theorem

Quadrilaterals: classification overview

Parallelograms: properties

Rectangles, rhombi, squares: properties

Trapezoids and kites

Polygon angle sums

Regular polygons

Convex vs. concave polygons

Proofs involving polygons

Constructions: basic tools

Constructions: perpendicular and parallel lines

Unit assessment