Dab tsi parallelograms muaj kab pheeb ces kaum uas sib sib zog nqus?
Dab tsi parallelograms muaj kab pheeb ces kaum uas sib sib zog nqus?

Video: Dab tsi parallelograms muaj kab pheeb ces kaum uas sib sib zog nqus?

Video: Dab tsi parallelograms muaj kab pheeb ces kaum uas sib sib zog nqus?
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Anonim

Yog ob sab ntawm ib sab ntawm ib parallelogram yog sib npaug, ces nws yog rhombus. Qhov kev sim no feem ntau coj los ua lub ntsiab lus ntawm rhombus. Ib quadrilateral uas diagonals bisect ib leeg ntawm txoj cai kaum yog rhombus.

Ib yam li ntawd, puas yog tag nrho cov parallelograms muaj kab pheeb ces kaum uas sib sib zog nqus?

Hauv ib qho twg parallelogram , cov kab pheeb ces kaum (kab txuas rov qab cov ces kaum) sib sib . Ntawd yog, txhua kab pheeb ces kaum txiav cov lwm yam ua ob qhov sib npaug.

Kuj Paub, dab tsi yog cov kab pheeb ces kaum ntawm parallelogram? Cov kab pheeb ces kaum sib sib. Ib khub ntawm opposite sab yog parallel thiab sib npaug ntawm qhov ntev. Cov ces kaum uas nyob ib sab yog ntxiv. Txhua kab pheeb ces kaum faib lub quadrilateral rau hauv ob daim duab peb sab congruent.

Ua qhov no hauv kev xav, puas yog kab pheeb ces kaum ntawm parallelogram bisect ib leeg ntawm 90?

Nws yog ib qho yooj yim los ua pov thawj tias cov kab pheeb ces kaum ntawm a parallelogram (thiab yog li ntawm qhov tshwj xeeb parallelogram hu ua rectangle) sib sib . Yog lub kaum sab xis uas lawv ntsib yog 90 ∘, tom qab ntawd los ntawm Pythagorean Theorem txhua sab ntawm daim duab plaub muaj qhov ntev √p2 + q2.

Puas yog kab pheeb ces kaum ntawm lub trapezoid bisect ib leeg?

Cov kab pheeb ces kaum ntawm ib qho isosceles trapezoid kuj congruent, tab sis lawv ua TSIS TAU sib sib . Isosceles Trapezoid diagonals Theorem: Cov kab pheeb ces kaum ntawm ib qho isosceles trapezoid yog concruent. midsegment (ntawm a trapezoid ) yog ib txoj kab uas txuas cov midpoints ntawm cov tsis sib npaug.

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