Dab tsi yog rotational symmetry hauv geometry?
Dab tsi yog rotational symmetry hauv geometry?

Video: Dab tsi yog rotational symmetry hauv geometry?

Video: Dab tsi yog rotational symmetry hauv geometry?
Video: Txoos Xwm khiav mus ua dab.8/25/2018 2024, Hlis ntuj nqeg
Anonim

Rotational Symmetry . Ib lub cev muaj Rotational Symmetry thaum nws tseem zoo li qub tom qab qee qhov kev sib hloov (ntawm tsawg tshaj li ib tug puv puv).

Ib yam li ntawd, lub ntsiab lus ntawm rotational symmetry yog dab tsi?

Rotational symmetry yog thaum ib yam khoom tig ib ncig ntawm qhov chaw nruab nrab (tig) tus lej ntawm cov degrees thiab cov khoom tshwm tib yam. Qhov kev txiav txim ntawm symmetry yog tus naj npawb ntawm txoj haujlwm qhov khoom zoo ib yam hauv 360-degree kev sib hloov.

Tsis tas li ntawd, hom symmetry yog dab tsi? Nws muaj peb hom qauv yooj yim:

  • Radial symmetry: Lub cev zoo li lub ncuav qab zib.
  • Ob sab symmetry: Muaj ib qho axis; ntawm ob sab ntawm lub axis lub cev zoo li roughly tib yam.
  • Spherical symmetry: Yog tias lub cev raug txiav los ntawm nws qhov chaw, qhov tshwm sim zoo ib yam.

Tom qab ntawd, dab tsi yog kev sib hloov symmetry muab piv txwv?

Ntau cov duab muaj kev sib hloov symmetry , xws li duab plaub, squares, voj voog, thiab tag nrho cov polygon tsis tu ncua. Xaiv ib yam khoom thiab tig nws mus txog 180 degrees nyob ib ncig ntawm nws qhov chaw. Yog hais tias nyob rau hauv ib qho taw tes cov khoom tshwm raws nraim li nws tau ua ua ntej lub kev sib hloov , ces cov khoom muaj kev sib hloov symmetry.

Puas yog tsab ntawv N muaj kev sib hloov symmetry?

Peev ntawv uas muaj rotational symmetry yog: Z, S, H, N thiab O. Piv txwv ntawm ntawv nrog kab rov tav ntawm symmetry suav nrog B, C, D, E, H, I, K, O, S thiab X.

Pom zoo: