Theorems · Theorem · geometry

EuclideanGeometry.oangle_midpoint_left

∀ {V : Type u_1} {P : Type u_2} [inst : NormedAddCommGroup V] [inst_1 : InnerProductSpace ℝ V] [inst_2 : MetricSpace P]
  [inst_3 : NormedAddTorsor V P] [hd2 : Fact (Module.finrank ℝ V = 2)] [inst_4 : Module.Oriented ℝ V (Fin 2)]
  (p₁ p₂ p₃ : P), EuclideanGeometry.oangle (midpoint ℝ p₁ p₂) p₂ p₃ = EuclideanGeometry.oangle p₁ p₂ p₃

An oriented angle is unchanged by replacing the first point with the midpoint of the segment between it and the second point.

Defined in

Mathlib.Geometry.Euclidean.Angle.Oriented.Affine

Cited by

1 results in Mathlib

Foundations

Depth 288 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

NormedAddCommGroupInnerProductSpaceMetricSpaceNormedAddTorsorFactModule.Oriented