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Angle facts 2
Exterior angle: Derive, then apply, the exterior-angle fact.
Polygon sum: Count triangles, not sides.
Regular polygons: Equal turns total 360°.
Deduction 1
Geometric reasons: Link each step to a named property.
Deriving quadrilateral facts: A diagonal links shape properties to triangles.
Technology and evidence: Preserve constraints and distinguish evidence from proof.
