M'bukuli, tiwona tanthauzo ndi zofunikira za isosceles trapezoid.
Kumbukirani kuti trapezoid amatchedwa isosceles (kapena isosceles) ngati mbali zake zili zofanana, mwachitsanzo AB = CD.
Katundu 1
Ma angles pa maziko aliwonse a isosceles trapezoid ndi ofanana.
- ∠DAB = ∠ADC = a
- ∠ABC = ∠DCB = b
Katundu 2
Chiwerengero cha ngodya zotsutsana za trapezoid ndi 180 °.
Pa chithunzi pamwambapa: α + β = 180°.
Katundu 3
Ma diagonal a isosceles trapezoid ali ndi kutalika kofanana.
AC = BD = d
Katundu 4
Kutalika kwa isosceles trapezoid BEkutsitsa patsinde lalitali kwambiri AD, amagawaniza zigawo ziwiri: choyamba ndi chofanana ndi theka la chiwerengero cha maziko, chachiwiri ndi theka la kusiyana kwawo.
Katundu 5
Gawo la mzere MNkulumikiza nsonga zapakati pa maziko a isosceles trapezoid ndi perpendicular ku maziko awa.
Mzere wodutsa pakati pa maziko a isosceles trapezoid amatchedwa ake olamulira ofananira.
Katundu 6
Bwalo likhoza kuzunguliridwa mozungulira isosceles trapezoid iliyonse.
Katundu 7
Ngati kuchuluka kwa maziko a isosceles trapezoid ndi wofanana kawiri kutalika kwa mbali yake, ndiye kuti bwalo likhoza kulembedwa mmenemo.
Utali wa bwalo lotere ndi wofanana ndi theka la kutalika kwa trapezoid, mwachitsanzo R = h/2.
Zindikirani: zina zonse zomwe zimagwira ntchito pamitundu yonse ya trapezoid zimaperekedwa m'mabuku athu -.