Ib kab tsis muaj qhov xaus. Ib kab ntu muaj ob qhov kawg. Ib kab ntu txuas ob qhov kawg. Yog tias ob kab tsis tuaj yeem sib ntsib ntawm ib qho twg, lawv hu ua kab sib dhos.
Muaj pes tsawg lub ntsiab lus kawg?
A ray has one endpoint. Cov rays no tsim cov kab uas tsis muaj qhov kawg. Thiab thaum kawg, thaum cov kab no tau txhais ntawm qee cov ntsiab lus kawg, lawv hu ua kab ntu. Thiab ib kab ntu muaj ob qhov kawg.
Puas muaj pes tsawg cov ntsiab lus hauv qab no muaj kuv kab ntu II kab III kab?
kab ntu muaj 2 kawg cov ntsiab lus. Ray muaj 1 qhov kawg taw tes thiab kab tsis muaj qhov kawg.
Puas muaj pes tsawg qhov kawg ua ntu muaj?
Ib ntu yog ib feem ntawm kab uas muaj ob qhov kawg thiab muaj qhov ntev. Ntawm qhov tod tes, ib txoj kab hluav taws xob kuj yog ib feem ntawm kab uas muaj ib qho kawg thiab lwm qhov kev taw qhia txuas ntxiv mus tsis kawg.
Qhov twg hauv qab no muaj ib qho kawg?
A ray muaj ib qho kawg. Peb tuaj yeem tsim hluav taws xob infinitely hauv ib qho kev coj.
