Worked examples (K-A)

• Challenge problems: perimeter & area (K-A)
• Challenging perimeter problem (K-A)
• CA Geometry: Proof by contradiction (K-A)
• CA Geometry: More proofs (K-A)
• CA Geometry: Similar triangles 1 (K-A)
• CA Geometry: More on congruent and similar triangles (K-A)
• CA Geometry: Triangles and parallelograms (K-A)