Indlela yokuthola azungezwe we ipholigoni?

Omunye esikoleni samabanga aphansi, abantu abaningi bekhumbula indlela yokuthola azungezwe iyiphi ukuma Jomethri: ukufunda obuphelele ngokwanele zezinhlangothi zalo nasezindongeni ukuthola isamba yabo. Ipherimitha ngokuthi ubude sesisonke we imingcele indiza sibalo. Ngamanye amazwi, isamba ubude lwaso. Yokukala kumele luhambisane azungezwe yokukala lwaso. ipholigoni ipherimitha inefomula P ifomu = a + b + c ... + n, lapho P - ipherimitha, kodwa a, b, c futhi n - obuphelele yohlangothi ngalunye. Kungenjalo ibalwa selilonke (noma umbuthano ipherimitha) isebenzisa P ifomula = 2 * π * r, ukuphi - engaba, futhi π - inombolo njalo cishe 3.14. Cabangela ezinye zezibonelo ezenzeke elula ezibonisa indlela ukuthola ipherimitha. Njengoba isibonelo sithatha bobunjwa ezifana isikwele, unxande, unxantathu, parallelogram futhi umbuthano.

Indlela yokuthola azungezwe we isikwele

Square ebizwa ngokuthi quadrangle kwesokudla, okuyinto ayalingana kuzo zonke izinhlangothi nama-engeli. Njengoba zonke izinhlangothi isikwele bayalingana, isamba ubude ezinhlangothini zalo ingabalwa by ifomula P = 4 * a, nalapho - ubude uhlangothi. Ngakho, i-ipherimitha sikwele ne izinhlangothi 16.5 cm P = 4 * 16.5 = 66 cm. Ngakho kungenzeka ukubala azungezwe rhomb equilateral.

Indlela yokuthola azungezwe isikwele

Unxantathu - isikwele zazo emagumbini kukhona-90 degrees. Kuyaziwa ukuthi kule sibalo, konxantathu, ubude izinhlangothi bayalingana ngazimbili. Uma ububanzi nobude we isikwele zinobude obulinganako, ibizwa ngokuthi isikwele. Ngokuvamile libizwa ngokuthi enkulu isikwele eside izinhlangothi, ububanzi - kulencane kakhulu. Ngakho, ukuze sithole azungezwe we isikwele, kubalulekile ukuba kabili ububanzi nobude: P = 2 * (a + b), lapho - ukuphakama, futhi b - ububanzi. Ngenxa yokuba khona isikwele, kolunye uhlangothi okuyinto futhi eside ubanzi 15 cm kanye nezinye anenani isethi 5 cm, sithola ipherimitha elilingana P = 2 * (15 + 5) = 40 cm.

Indlela yokuthola azungezwe unxantathu

Unxantathu kumiswa umugqa ezintathu izingxenye okuyinto ukuxhuma amaphuzu (vertices unxantathu), kangiqambi manga emgqeni efanayo ngqo. A unxantathu libizwa equilateral uma zonke ezintathu ayalingana isandla sakhe, futhi izinhlangothi isosceles uma ezimbili alinganayo. Ukuze uthole azungezwe unxantathu equilateral, udinga uphindaphinde obuphelele ezinhlangothini zalo by 3: P = 3 * a, lapho - omunye ezinhlangothini zalo. Uma izinhlangothi unxantathu are lingana, kubalulekile ukuba afeze ukuhlinzwa kwalokho: P = a + b + c. Azungezwe unxantathu isosceles emaceleni 33, 33 no-44 ubudala, ngokulandelana, uyoba ilingana: P = 33 + 33 + 44 = 110 cm.

Indlela yokuthola azungezwe we parallelogram

Parallelogram - a quadrilateral ne izinhlangothi eziphikisanayo parallel pairwise. Square, idayimane kanye isikwele nomumo ezimweni ezikhethekile. izinhlangothi eziphikisanayo parallelogram ngamunye ayalingana, ngakho ukubala ipherimitha yayo usebenzisa ifomula P = 2 (a + b). Encwadini parallelogram ne izinhlangothi 16 cm futhi 17 cm isamba izinhlangothi noma ipherimitha elilingana P = 2 * (16 + 17) = 66 cm.

Indlela yokuthola selilonke

Selilonke umugqa avaliwe, wonke amaphuzu okuyinto zitholakala endaweni amabanga alinganayo kusukela maphakathi. Ubude kumbuthano futhi ubukhulu bayo njalo okufanayo. Lokhu isilinganiso esashiwo njalo, kulotshwe esebenzisa izinhlamvu π cishe 3,14159. Hlola azungezwe we umbuthano kungaba umkhiqizo engaba ngu-2 kanye π. It kuvela ukuthi engaba umbuthano ubude 15 cm kuyoba ulingana P = 2 * 3,14159 * 15 = 94,2477