ọdịnaya
convex quadrilateral - Nke a bụ ihe oyiyi geometric nwetara site na ijikọta isi anọ na ụgbọ elu nke na-ekwesịghị ịgha ụgha n'otu ahịrị kwụ ọtọ. N'okwu a, akụkụ ndị e mere n'ụzọ dị otú a ekwesịghị ịgbakọ.
Usoro mpaghara
N'akụkụ diagonals na akụkụ dị n'etiti ha
Mpaghara (S) nke convex quadrilateral bụ otu nke abụọ (ọkara) nke ngwaahịa nke diagonals ya na sine nke akụkụ dị n'etiti ha.
N'akụkụ anọ (usoro Brahmagupta)
Iji jiri usoro ahụ, ịkwesịrị ịma ogologo akụkụ niile nke ọnụ ọgụgụ ahụ. Ọ ga-ekwe omume ịkọwa okirikiri gburugburu akụkụ anọ.
p - ọkara okirikiri, gbakọọ dị ka ndị a:
N'akụkụ radius nke gburugburu na akụkụ ahụ edere
Ọ bụrụ na enwere ike ide okirikiri na akụkụ anọ, enwere ike gbakọọ mpaghara ya site na iji usoro a:
S = p ⋅ r
r bụ radius nke gburugburu.
Ọmụmaatụ nke nsogbu
Chọta ebe convex quadrilateral ma ọ bụrụ na diagonal ya bụ 5 cm na 9 cm na akụkụ n'etiti ha bụ 30 °.
Mkpebi:
Anyị na-edochi ụkpụrụ u1bu2b mara anyị n'ime usoro wee nweta: S u5d 9/30 * 11,25 cm * XNUMX cm * mmehie XNUMX ° uXNUMXd XNUMX cm2.