P16 · 2D Plane Geometry & ConstructionsSTUDIO
r = 2.8 cm · OP = 6.8 cm · Talete 90°SVG · PPTX · 1:1
P16 // 2D Plane Geometry & Constructions
Tangent Lines to a Circle from an External Point P (Thales' Circle)
Classical Euclidean construction of the two tangent lines from external point P to a circle using Thales' auxiliary circle on diameter OP.
Key formulas & geometric relations
PT₁ = PT₂ = √(OP² − r²) · OT₁ ⊥ PT₁ · OT₂ ⊥ PT₂