Zamkatimu
convex quadrilateral - Ichi ndi chithunzi cha geometric chopezedwa mwa kulumikiza mfundo zinayi pa ndege yomwe sayenera kugona pamzere umodzi wowongoka. Pamenepa, mbali zomwe zimapangidwira motere siziyenera kudutsa.
Area formula
Pamodzi ndi diagonals ndi ngodya pakati pawo
Chigawo (S) ya convex quadrilateral ndi yofanana ndi sekondi imodzi (theka) ya chopangidwa ndi ma diagonals ake ndi sine wa ngodya pakati pawo.
Pambali zinayi (chilinganizo cha Brahmagupta)
Kuti mugwiritse ntchito ndondomekoyi, muyenera kudziwa kutalika kwa mbali zonse za chiwerengerocho. Ziyeneranso kufotokozera mozungulira kuzungulira quadrilateral.
p - semi-perimeter, yowerengedwa motere:
Pafupi ndi utali wa bwalo lolembedwa ndi mbali
Ngati bwalo likhoza kulembedwa mu quadrilateral, dera lake likhoza kuwerengedwa pogwiritsa ntchito ndondomekoyi:
S = p ⋅ r
r ndi utali wa bwalo.
Chitsanzo cha vuto
Pezani dera la convex quadrilateral ngati ma diagonal ali 5 cm ndi 9 cm ndipo ngodya pakati pawo ndi 30 °.
Kusankha:
Timalowetsa zinthu zomwe u1bu2bzodziwika kwa ife m'njirayo ndikupeza: S u5d 9/30 * 11,25 cm * XNUMX cm * sin XNUMX ° uXNUMXd XNUMX cm2.