A cikin yara, mun lasafta square sai a cikin darussan lissafi. A cikin rayuwar manya tare da irin wannan wajibi, muna fuskantar lokacin da muka gyara, muna shirin sanya kayan aikin daga mai haɓakawa.
"Kawo da kuma yi" yana nuna yadda ake yin lissafin yankin da ya dace da sifofin geometric: murabba'i, murabba'i, da'ira, alwatika da trapezium.
Yadda ake lissafta yankin murabba'i mai dari
Don lissafin yankin murabba'i mai dari, kuna buƙatar ninka tsawon adadi a kan faɗi. Da ace muna auna yankin. Yana da tsawon lokaci 6, kuma a cikin nisa - 3 m. Ina ninka 6 zuwa 3 kuma ku sami ɗakin ɗakin - 18 murabba'in mita 18. m.
Yadda ake lissafta murabba'i mai ƙarfi
An lasafta yankin murabba'i ɗaya a cikin irin wannan hanyar: Tsawon sa ya yawaita ta hanyar. Amma, kamar yadda muka sani, bangarorin wannan adadi daidai suke da juna. Sabili da haka, dabara ta sauko kan gina ɓangarorin ɓangarorin zuwa filin.
Yadda ake lissafta yankin da'irar
Dan kadan da wuya a lissafta yankin da'irar. Don yin wannan, kuna buƙatar sanin radius, wanda daidai yake da rabin diamita. Diamita kanta wani yanki ne wanda ke haɗa maki 2 akan da'irar kuma ya wuce ta hanyar cibiyar. Don kirga yankin, auna diamita kuma raba sakamakon da 2. ✅ Tsarin yankin yanki yayi kama da wannan: muna ɗaukar adadin pi (kusan 3.14) kuma ninka yawan Pi a cikin murabba'in. Ya kasance don tuna cewa sakamakon lissafin ba zai zama cikakke cikakke ba, tun da lambar PI tana da ƙimar kimantawa. A ce muna lissafin yankin ta hanyar rufe kayan ado a karkashin chandelier. Da farko auna diamita. Bari ya kasance daidai yake da 0.46 m. Mun raba shi zuwa 2 kuma sami darajar radius na 0.23 m. Za a gina mu cikin wani square: 0.23 * 0.23 = 0.0529. Sannan ka riɓaɓɓanya ta lamba pi: 3.14 * 0.0529 = 0.1661. A sakamakon haka, yankin mafita shine 0.1661 murabba'in mita. m.
Yadda ake lissafta yankin na hannun dama alwatika
Lissafta yankin daidai ko alwatika masu daidaitawa - aikin ya fi rikitarwa. Walcin yayi kama da wannan: murabba'in murabba'in 3 ya kasu kashi 4 kuma ninka ta tsawon ɗayan bangarorin a cikin murabba'i. Mun sauƙaƙa ɓangaren farko: tushen murabba'in 3 shine kusan 1.732. Muna raba sakamakon da 4, muna samun kusan 0.433. Wannan adadi shi ne kullun na dabara. Yanzu mun dauki tsawon ɗayan bangarorin (bari daidai yake da 20), za a fitar da mu cikin wani square kuma za mu riɓaɓɓanya 0.433. Mun sami yankin - murabba'in mita 173.2. cm.
Yadda ake lissafta yankin na rectangular alwatika
Tare da alwatika na rectangular, komai ya fi sauƙi ne: ninka 1/2 akan aikin na harafi). Misali, idan gefen gefen alwatika shine 6 cm, kuma ƙananan shine 4 cm, to, yankinta mun lissafta wannan: 1/2 (6 * 4) = 12 kv. cm.
Yadda ake yin lissafin murabba'in trapez
Don nemo yankin trapezium, raba tsayinta cikin 2 kuma ninka adadin tarnaƙi. Misali, idan tsawo na trapezium ne 4 cm, gefen babba shine 3 cm / 2 (B1 (B1) na yankin na adadi yayi kama da wannan: 4/2 (3 + 6) = 2 * 9 = 18.
