ọdịnaya
N'ime akwụkwọ a, anyị ga-atụle nkọwa na isi ihe dị n'etiti ahịrị nke convex quadrilateral gbasara ebe njikọ ha, mmekọrịta na diagonals, wdg.
Cheta na: Na nke na-esote, anyị ga-atụle naanị ọnụ ọgụgụ convex.
Mkpebi nke etiti ahịrị nke akụkụ anọ
A na-akpọ akụkụ nke na-ejikọta etiti etiti nke akụkụ ndị ọzọ nke akụkụ anọ (ya bụ, ọ bụghị ịgbanye ha) ya. ahịrị etiti.
- EF - ahịrị etiti na-ejikọta ebe etiti AB и CD; AE=EB, CF=FD.
- GH - ahịrị etiti na-ekewa ebe etiti BC и AD; BG=GC, AH=HD.
Njirimara nke etiti ahịrị nke akụkụ anọ
Ngwongwo 1
Ahịrị dị n'etiti nke akụkụ anọ nke akụkụ anọ na bisect n'ebe nkwụsịtụ.
- EF и GH (ahịrị etiti) na-agbakọta n'otu ebe O;
- EO=OF, GA=OH.
Cheta na: Point O is etiti (ma ọ bụ barrycenter) akụkụ anọ.
Ngwongwo 2
Ebe nkedo nke etiti etiti nke quadrilateral bụ etiti etiti nke na-ejikọta etiti nke diagonals ya.
- K - n'etiti diagonal AC;
- L - n'etiti diagonal BD;
- KL na-agafe otu isi ihe O, jikọọ K и L.
Ngwongwo 3
Ebe etiti n'akụkụ akụkụ anọ bụ akụkụ myirịta a na-akpọ Parallelogram nke Varignon.
Ebe etiti nke parallelogram a kpụrụ n'ụzọ dị otú a na ebe nkwụsị nke diagonals ya bụ etiti etiti etiti nke mbụ quadrilateral, ya bụ ebe ha na-agafe. O.
Cheta na: Mpaghara nke parallelogram bụ ọkara akụkụ nke akụkụ anọ.
Ngwongwo 4
Ọ bụrụ na akụkụ dị n'etiti diagonal nke akụkụ anọ na etiti ya hà nhata, mgbe ahụ, diagonal nwere otu ogologo.
- EF - ahịrị etiti;
- AC и BD - diagonal;
- ∠ELC = ∠BMF = a, N'ihi ya AC=BD.
Ngwongwo 5
Midline nke akụkụ anọ dị ihe na-erughị ma ọ bụ hà nhata na ọkara nchikota nke akụkụ ya na-adịghị ejikọta (ọ bụrụhaala na akụkụ ndị a na-ejikọta).
EF - eriri etiti nke na-adịghị ejikọta ya na akụkụ AD и BC.
N'ikwu ya n'ụzọ ọzọ, etiti etiti nke akụkụ anọ dị ka ọkara nke nchikota nke akụkụ ndị na-adịghị ejikọta ya ma ọ bụrụ na ọ bụrụ na ọ bụrụ na e nyere quadrilateral bụ trapezoid. N'okwu a, akụkụ ndị a na-atụle bụ ntọala nke ọnụ ọgụgụ ahụ.
Ngwongwo 6
Maka vector midline nke akụkụ anọ aka aka ike, nha anya na-esote:
