Theorems · Theorem · geometry

EuclideanGeometry.angle_eq_pi_div_two_of_oangle_eq_pi_div_two

∀ {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 p₁ p₂ p₃ = ↑(Real.pi / 2) → EuclideanGeometry.angle p₁ p₂ p₃ = Real.pi / 2

If the oriented angle between three points is π / 2, so is the unoriented angle.

Defined in

Mathlib.Geometry.Euclidean.Angle.Oriented.Affine

Cited by

13 results in Mathlib

Foundations

Depth 284 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

NormedAddCommGroupInnerProductSpaceMetricSpaceNormedAddTorsorFactModule.Oriented