Enigma

Enigmes & Problèmes scientifiques

Altitude

From Gogeometry Using Additional points Inscribed angles in a circle central and inscribed angle congruent triangles Concyclic points ∠ABC=∠ADC = π/2 => ABCD are concyclic with center O=> OA=OD=OC=OB Define D’ such as ΔCAD is congruent to ΔCAD’∠CDA=∠CD’A = π/2 =>D’ is on the circle O=> ∠ACD= ∠ACD’= α => […]

Gogeometry Problem 017

dans Euclide Geometry Problem / Géométrie Euclidienne étiqueté Altitude / Auxiliary Lines / Double Angle / Right triangles par Harvey Littleman

From Gogeometry Define a=AB=BC=AC DC and DB tangents to Circle O1 => DG=DE=bAD and AB tangents to Circle O1 => AG=AJ=dDB and BA tangents to Circle O1 => BE=BJ=c DB and BC tangents to Circle O2 => BF=BK=eDC and BC tangents to Circle O2 => CI=CK=f a=d+c=e+fDF=b+c+e, DI=b+d+a+fDC and DB […]

Gogeometry Problem 1372

dans Euclide Geometry Problem étiqueté Altitude / Equilateral Triangle / Exradius / Exterior Cevian / Inradius par Harvey Littleman