Lub ntsiab lus ntawm a square yog ib daim duab nrog plaub sab sib npaug thiab plaub lub kaum sab xis. Lub square yog txawv los ntawm ib lub duab plaub nyob rau hauv uas txhua sab ntawm ib tug square yog sib npaug ntawm qhov ntev. Cov sab nraud kuj sib npaug rau ib leeg.
Dab tsi muaj 4 qhov sib npaug thiab lub kaum sab xis?
A square yog quadrilateral nrog 4 sab sib npaug thiab 4 lub kaum sab xis. Ib daim duab nrog plaub sab ntawm qhov sib npaug ntawm qhov ntev.
Yuav ua li cas quadrilateral uas muaj 4 sib npaug sab thiab 4 txoj cai kaum?
Ib lub square tuaj yeem txhais tau tias yog rhombus uas tseem yog ib daim duab plaub - hauv lwm lo lus, ib qho parallelogram nrog plaub sab congruent thiab plaub txoj cai kaum.
Dab tsi ib txwm muaj 4 lub kaum sab xis?
Ib daim duab plaub yog plaub fab nrog 4 lub kaum sab xis (90 °). Nyob rau hauv ib lub duab plaub, ob khub ntawm opposite sab yog parallel thiab sib npaug ntawm qhov ntev. Cov khoom ntawm cov duab plaub: Txhua lub kaum sab xis yog kaum sab xis.
Puas yog lub trapezoid muaj 4 sab thiab 4 lub kaum sab xis?
Ib lub trapezoid yog plaub sab, uas txhais tau tias nws muaj plaub sab. Ob sab yuav tsum ua tib zoo sib npaug rau ib leeg kom nws ua lub trapezoid. Lub trapezoid kuj muaj plaub lub kaum.