Five-rwakavakwa nyeredzi. Sei nokukurumidza uye nyore nyore kurudzosa

Five-rwakavakwa nyeredzi - kupfuura vairemekedza chiratidzo zvose marudzi enyika nguva dzose. zvifananidzo zvaro pana pakutanga yebudiriro, kana hamuna yakambogadzirirwei kunyora.

The mufananidzo wokutanga ane shanu-wakananga nyeredzi, kuwanikwa nevanochera, yakatanga kusvika 3500 gore BC. It akabatwa ari Hwendefa, akawana Pavaichera ari Sumerian guta Uruk.

nyeredzi chiratidzo yakanga yakakurumbira muIjipiti yekare uye Bhabhironi. Iye airemekedzwa nevaRoma vekare uye navaGiriki, kunze shanu-rwakavakwa nyeredzi chiratidzo ichitanga zvakasikwa. Five pamakona Star nevaGiriki chokuita nezvinhu zvishanu izvo akasika nyika yedu - pasi, mvura, mhepo, moto uye Eteri.

Five-rwakavakwa nyeredzi ndiwo chizenga majasi kwezvombo uye mireza yakawanda ano inoti uye aripo panguva uto insignia.

Asi kuti vaswedere ichi nyore nhamba hakusi nyore sezvo zvingaita sokuti pakutanga kuaona.

How kuzochera ane shanu-wakananga nyeredzi, pasina nokusimudza penzura kubva bepa

Guru muzivi wechiGiriki uye nyanzvi yemasvomhu Achibvuma pfungwa yaPythagoras akadana shanu-rwakavakwa nyeredzi kwemasvomhu zvakakwana. Kutaura zvazviri, mufananidzo uyu unogona kuva zvakaoma kuwana yakaputsika mutsetse, pasina nokusimudza penzura kubva bepa jira vodzokera pakupera yakafanana pokutangira, iyo yakatangwa richiswedera.

Heunoi iye, kunzwisisa uye iri nyore Pakutanga, mufananidzo - mashanu-wakananga nyeredzi. zviri sei kuswedera akatyoka mutsetse pachena kubva nhamba.

How kuzochera nyeredzi, achishandisa mutongi uye protractor

Zvino tinodzidza sei kuswedera zvakakodzera shanu-rwakavakwa nyeredzi. Of zvishandiso inodiwa mutongi uye protractor.

Kuti vasvike kune nyeredzi, zvinokosha kubata zvikamu yakaenzana urefu kuitira kuti dzomunyika pamakona pakati ose shanu vertices nhamba akanga akaenzana 36 °. In tsika, ichi rinoitwa sezvinotevera - kwaswedera panguva necheparutivi 36 °, kubva ayo pamusoro zvikamu yakaenzana urefu vari akayera, uye endpoints dzavo inoitwa zvakananga itsva necheparutivi 36 °.

Zvinogonekawo kutaura dambudziko nzira siyanei nokuswedera ane equilateral nePentagon pamwe vertices pamusoro pamakona ose 106 °, uye ipapo kubatana mapazi eumambo pakatarisana makona ayo.

Kana iwe ucharamba ose ezvinhu, iwe achapedzisira yakanaka shanu-rwakavakwa nyeredzi. How kurudzosa zviri nyore nzira, verenga mberi.

How kuzochera nyeredzi achibatsirwa nekambasi uye protractor

Zvino iwe unofanira kuva kambasi uye protractor. Sezvo sekamufarenzi ose 360 °, ipapo 1/5 zvikamu - 72 ° (360: 5 = 72). Kusvika kuvakwa.

Dhirowa denderedzwa rine nekambasi. Maka pokutangira pairi - pamusoro nyeredzi uye pakati denderedzwa. Tora protractor, swatanudza centre waro pakati denderedzwa, uye yose sekamufarenzi pakureba ona ngozi ramangwana nyeredzi pfungwa nenhongonya ose 72 °.

Batanidza navo kuramba akarurama, uye kuwana yakanaka shanu-rwakavakwa nyeredzi. How kurudzosa, kana kwete panguva ruoko achava protractor? Pasina izvozvo, unogona kuita, uchada chete chombo mutongi uye nekambasi.

How kuzochera nyeredzi ine mutongi uye nekambasi

How kuzochera ane shanu-wakananga nyeredzi nekambasi? Funga imwe musimboti.

Dhirowa denderedzwa. Kuyera dhayamita pamwechete nomubati. Tinobudisa nyore kwemasvomhu matanho: vachiwedzera kuti dhayamita pamusoro denderedzwa pedyo chinhu 0,58779. The mugumisiro - anodiwa kureba Chord (yakarurama mutsetse unobva mbiri pfungwa yacho munyonga mutsetse, sezvo kwatiri - denderedzwa), iro tinogona kuganhura denderedzwa kupinda 5 zvakaenzana nhengo.

Somuenzaniso, dhayamita ari denderedzwa akaenzana 7 cm. Muwande 7 X 0.58779 = 4.11453, vakagumisa kuti chegumi pedyo (sezvo anokweva bepa chidimbu haasi zvikuru chaiwo urefu zvichibvira) tinowana 4.1 cm. Ndiyo aida kureba Chord.

Zvazvinosarira kusunda uye kugadzirisa chinongedzo makumbo pamusoro kukosha ichi, uye zvinogona kuita cheka kutenderera. Kana iwe batanidza navo, iwe kuwana shanu-wakananga nyeredzi.

How kuzochera dimikira iri imwe nzira? Funga musimboti 2.

Chokutanga, tara dzose nePentagon, nokudhindwa denderedzwa. How kuzochera zvakakodzera shanu-rwakavakwa nyeredzi hwayo, kuratidzwa Figure 2.

Swedera chinongedzo denderedzwa. Conditionally kunan'anura nayo sezvo muzinda O. A pfungwa O kuzochera yakarurama - the dhayamita kuti denderedzwa redu. Ataure nharaunda yacho denderedzwa zvokuti perpendicular kune dhayamita. kuti nharaunda iri pfungwa mharadzano chete denderedzwa runotaurwa V. On rworuboshwe pfungwa vanotsaura daro yakaenzana hafu Kureba nharaunda pamusoro denderedzwa ichi, kunan'anura pfungwa dzayo A. Kubva nguva A kuburikidza pfungwa V kuzochera munhu denderedzwagama ane dhayamita dzinza mharadzano (ari kuchiona inosimbiswa tsvuku) uye kunan'anura kwayo nguva B. VB chidimbu kureba Chord kureba, achishandisa iyo sekamufarenzi rakakamurwa 5 zvakaenzana nhengo. Zvichaita chete vane kubatanidza umboo pfungwa iri muchimiro nyeredzi.