Unit 07 · Weeks 19, 20, 21

Polygons & Quadrilaterals

How do angle sums, side relationships, and coordinate evidence classify and constrain polygons?

Begin Unit Core Practice Mastery Check Applied Investigation

Lesson sequence

7 visual, printable lessons

Interior and Exterior Angles of Polygons

Derive and apply polygon interior-angle sums and the constant exterior-angle sum.

Parallelogram Properties & Tests

Classify polygons and quadrilaterals using angle sums, side relationships, diagonals, symmetry, and coordinate evidence.

Rectangles, Rhombi & Squares

Classify polygons and quadrilaterals using angle sums, side relationships, diagonals, symmetry, and coordinate evidence.

Trapezoids, Kites & Midsegments

Classify polygons and quadrilaterals using angle sums, side relationships, diagonals, symmetry, and coordinate evidence.

Quadrilateral Coordinate Proofs

Classify polygons and quadrilaterals using angle sums, side relationships, diagonals, symmetry, and coordinate evidence.

Regular Polygons, Apothem & Central Angles

Use apothem, perimeter, central angle, and decomposition into congruent triangles.

Polygon Decomposition & Design Constraints

Classify polygons and quadrilaterals using angle sums, side relationships, diagonals, symmetry, and coordinate evidence.

Connected laboratories

Geometry beyond the worksheet

Sacred Geometry Studio

Investigate radial repetition, transformations, symmetry, circles, regular polygons, and exportable vector designs.

Open Arcade Studio

Foundation

Vocabulary, marked diagrams, guided constructions, and reduced-complexity practice.

Open Foundation

Core

Complete grade-level reasoning, calculation, proof, and printable evidence.

Extended

Generalization, proof revision, optimization, design, and transfer.