Trapezium: Ib lub quadrilateral uas muaj ib khub ntawm qhov sib txawv ntawm qhov sib npaug yog hu ua trapezium. Lub trapezium tsis yog hom parallelogram. Square: Ib lub xwmfab yog quadrilateral nrog rau txhua sab ntawm qhov sib npaug ntawm qhov ntev, txhua lub kaum sab xis raws li cov ces kaum sab xis thiab sab nraud sib npaug rau ib leeg.
Qhov twg tsis yog parallelogram?
Thaum kawg, a trapezium yog ib lub quadrilateral nrog ib khub ntawm ob sab sib npaug thiab lwm khub ntawm sab nraud tsis yog sib npaug. Yog li, los ntawm cov ntsiab lus saum toj no nws yog qhov tseeb tias trapezium tsis yog parallelogram, raws li kev ua ib qho parallelogram txhua khub ntawm sab nraud yuav tsum sib npaug thiab sib npaug.
Ib qho piv txwv ntawm qhov tsis yog parallelogram yog dab tsi?
Ib tug trapezoid tsuas muaj ib khub ntawm ob sab sib npaug rau ib leeg. Tsis tas li ntawd, lub trapezoid tsis muaj qhov sib npaug sib npaug rau ib leeg. Li no, nws yog plaub fab tab sis tsis yog parallelogram.
Yuav ua li cas tsis yog ib qho parallelogram?
Ib qho piv txwv yog plaub plaub fab nrog 2 khub ntawm qhov sib txawv, sib npaug thiab sib npaug. Ib daim duab plaub yog plaub plaub fab uas muaj 2 khub ntawm qhov sib npaug, sib npaug thiab sib npaug sab tab sis kuj tseem ua cov kaum sab xis ntawm cov uas nyob ib sab. … Ib yam nkaus uas tsis yog tag nrho rectangles yog squares, tsis yog tag nrho cov parallelograms yog duab plaub.
Koj paub li cas yog nws qhov parallelogram lossis tsis?
Yog tias ob khub ntawm ob sab ntawm sab nraud ntawm plaub plaub yog sib npaug, ces nws yog ib qho parallelogram (rov qab ntawm lub ntsiab lus). Yogob khub ntawm opposite sab ntawm ib tug quadrilateral yog congruent, ces nws yog ib tug parallelogram (converse ntawm ib tug khoom).
