1. A háromszög - ismétlés
Author: zsuzsa@geogebra.org

A háromszög belső szögeinek összege 180°.

α

anim = 0 rad (slider from 0 to 3.141592653589793, step 0.017453292519943295)
A = (-4.546493220330375, 2.355927686808059)
B = (4.473967419941256, 2.389091145044352)
C = (0.8591504721853449, 8.922292417594026)
hsz, c, a, b = Polygon(A, B, C)
F_{AB} = Midpoint(B, A)
F_{AC} = Midpoint(A, C)
F_{BC} = Midpoint(B, C)
β_2 = Rotate(B, anim, F_{BC})
β_1 = Rotate(F_{AB}, anim, F_{BC})
β_3 = Rotate(F_{BC}, anim, F_{BC})
α_2 = Rotate(A, anim, F_{AC})
α_1 = Rotate(F_{AC}, anim, F_{AC})
α_3 = Rotate(F_{AB}, anim, F_{AC})
β' = Angle(β_1, β_2, β_3)
α' = Angle(α_1, α_2, α_3)
β_{12} = Segment(β_1, β_2)
β_{23} = Segment(β_2, β_3)
α_{23} = Segment(α_2, α_3)
α_{12} = Segment(α_1, α_2)
α, β, γ = Angle(hsz)
szövegγ: "γ=" + (180.0 * ° - round(α * 10.0) / 10.0 - round(β * 10.0) / 10.0)