Kodi kupeza dera kansalu kumene mu njira yachilendo

Pa maphunziro a masamu mu sekondale tonse analankhula za mmene kupeza malo a amakona anayi makona. Komabe, mu maphunziro kusukulu tili okha kudziwa zofunika kwambiri ndi kuphunzira zambiri ndi muyezo njira mawerengedwe. Kodi pali njira iliyonse zachilendo kupeza phindu izi?

Mawu oyamba, tiyeni kukumbukira zimene ankaona kuti ndi amakona anayi makona ndipo amatanthauza mfundo danga.

Kumanja makona amatchedwa chatsekedwa zojambula mawonekedwe, ngodya mmodzi amene ali wofanana 90 ^0. Chibadidwe kutanthauzira malingaliro a pa makona bwino ndi miyendo ndi hypotenuse. Pansi miyendo amatanthauza mbali ziwiri, zomwe pa mfundo mogwirizana kupanga mlingo woyenerera. Hypotenuse - kutsidya lina la mlingo woyenerera. Direct makona kungakhale isosceles (awiri a m'mbali mwake adzakhala ndi yofanana), koma sadzakhoza equilateral (mbali zonse kutalika). kutalika kudziwa apakatikati, zamoyo zina ndi mawu ena masamu sadzakhala kukambirana mwatsatanetsatane. Mosavuta opezeka mabuku.

M'dera la makona mwachindunji. Mosiyana rectangles ulamuliro ntchito maphwando mu tipeze malo a makona ndi si zomveka. Kulankhula chilankhulo youma mawu dera makona kumvetsa chuma cha zimakwana kutenga mbali ya ndege, chimaonetsera angapo. kovuta kuzindikira, kugwirizana. Ife sitikhala kuyesera kudutsa kwambiri mu tanthawuzo cholinga chathu ayi. Ife tsopano mutembenukire kwa mfundo zikuluzikulu - momwe kupeza dera kansalu bwino? Asayansi adzalandira wosabala, ife tinatchula chilinganizo yekha. Kuchita izi, ife chimatanthauza mayina: A, B, C - mbali ya makona, ndi miyendo - AB, BC. Njingayo ACB - mzere wolunjika. S - Malo makona, H _{N N} - kutalika kwa makona, kumene nn - chipani imene ndi adatchithisira.

Njira 1: Kodi kupeza dera kansalu bwino ngati tizindikira kufunika kwa mbali zina ziwiri

S = 0.5 * ndi * b

Njira 2: Pezani malo ya isosceles makona bwino

S = 0.5 * H _BC * _BC

3. Njira yowerengera rectangle malo kupyolera

Kumaliza kumanga kansalu ufulu lalikulu (ngati ndi kansalu isosceles) kapena rectangle. Ife kupeza quadrangle yosavuta lopangidwa 2 Triangles zofanana bwino. Pankhaniyi, malo a mmodzi wa iwo adzakhala wofanana ndi malo hafu ya chiwerengerochi analandira. S rectangle kuwerengetsa mankhwala mbali. Ife kutanthauza izi mtengo M. ankafuna mtengo adzakhala wofanana ndi malo theka M.

S = 0.5 * M

Njira 4: "Pythagorean mathalauza." Wotchuka Pythagorean Lingaliro Lovomerezeka

Tonse kumbukirani mawu ake: "Uwerenge mabwalo miyendo ...". Koma si wina aliyense angathe kunena, ndipo naŵa "mathalauza". chakuti choyambirira Pythagoras anaphunzira ubwenzi dera lalikulu, anamanga pa mbali ya makona mwachindunji. Apeze dongosolo mu makulidwe a mabwalo, ndipo iye anali wokhoza kubweretsa dongosolo odziwika bwino kwa ife tonse. Thiabendazole angagwiritsidwe ntchito pamene mtengo wosadziwika mmodzi wa zipani.

5. ndondomeko kupeza malo a makona bwino chilinganizo chimeza a

Ndi njira yotsika yosavuta kuwerengetsa. Ndondomeko kumaphatikizapo mawu a makona mwa mfundo n'zosangalatsa kumva mbali yake. Pakuti anapezazo ndi m'pofunika kudziwa phindu la mbali zonse za makona a.

S = (p-AC) * (p-BC), kumene tsa = (AB + BC + AC) * 0.5

Kuwonjezera pa pamwamba, pali njira zina zambiri kupeza ngati mtengo enigmatic chithunzi monga kansalu a. Pakati pawo njira mawerengedwe a alembedwa kapena circumscribed bwalo mawerengedwe ntchito vertex ndondomeko, ntchito zamoyo zina, ukulu mtheradi wa sines, tangents.