Mukati
Tsanangudzo dzekutanga
Rectangle i quadrilateral umo makona ese akaenzana. Iwo zvakare akatwasuka uye ari 90°.
Perimita ihuwandu hwehurefu hwemativi ese eporigoni. Zita rinowanzogamuchirwa ndiro guru rechiLatini tsamba P. Pasi pe "P", zviri nyore kunyora zita remufananidzo mumabhii maduku kuitira kuti usakanganiswe mumabasa ari munzira.
Kana kureba kwemativi kukapihwa muzvikamu zvakasiyana, hatizokwanisi kuwana perimeter yerectangle. Nokudaro, nokuda kwemhinduro yakarurama, zvakakosha kushandura data yose kune imwe chiyero chechiyero.
Perimeter inopimwa nei?
- millimeter (mm);
- masendimita (cm);
- decimeter (dm);
- mita (m);
- kiromita (km) nemamwe mayuniti ehurefu.
Muchinyorwa chino, tichaona nzira yekuverenga iyo perimeter yerectangle uye kuongorora mienzaniso yekugadzirisa matambudziko.
Perimeter Fomula
Mutsara (P) werectangle wakaenzana nehuwandu hwehurefu hwemativi ayo ose.
P = a + b + a + b
Nekuti mativi akasiyana echifananidzo ichi akaenzana, fomula inogona kumiririrwa sezvizvi:
- Rutivi ruviri: P = 2*(a+b)
- Huwandu hwemhando mbiri dzemativi: P = 2a+2b
Rutivi rupfupi ndiko kureba/upamhi hwerectangle, rutivi rurefu ndirwo hwaro/hurefu hwaro.
Mienzaniso yemabasa
Basa 1
Tsvaga perimeter yerectangle kana mativi ayo ari 5 cm uye 8 cm.
Sarudzo:
Isu tinotsiva iyo inozivikanwa tsika u2bu5binto fomula uye tinotora: P u8d 26 * (XNUMX cm + XNUMX cm) uXNUMXd XNUMX cm.
Basa 2
Iyo perimeter yerectangle ndeye 20 cm, uye imwe yemativi ayo ndeye 4 cm. Tsvaga rutivi rwechipiri rwemufananidzo.
Sarudzo:
Sezvatinoziva, P=2a+2b. Ngatitii 4cm idivi а. Saka divi risingazivikanwe b, yakapetwa kaviri, inoverengwa sezvinotevera: 2b u2d P - 20a u2d 4 cm - 12 * XNUMX cm uXNUMXd XNUMX cm.
Nokudaro, rutivi b = 12 cm / 2 = 6 cm.
Chinetso chokugadzirisa
Uye zvino dzidzira!
1. Rumwe rutivi rwerectangle i9cm uye rumwe rwakareba 11cm. Nzira yekuziva sei perimeter?
Tingasarudza sei:
Kana a = 9, zvino b = 9 + 11;
Zvadaro b = 20 cm;
Ngatishandise fomula P = 2 × (a + b);
P = 2 × (9 + 20);
Mhinduro: 58 cm.
2. Tsvaga perimeter yerectangle nemativi 30 mm uye 4 cm. Taura mhinduro yako nemasendimita.
Tingasarudza sei:
Shandura 30 mm kusvika masendimita:
30 mm = 3 cm.
Shandisa fomula yeperimeter yerectangle:
P \u003d 3 + 4 + 3 + 4 \u003d 14 cm.
Mhinduro: P = 14 cm.
3. Tsvaga perimeter ye triangle ine mativi 2 mukati uye 300 mm. Taura mhinduro yako nemasendimita.
Tingasarudza sei:
Ngatishandure kureba kwemativi kuita masendimita:
2 dm = 20 cm, 300 mm = 30 cm.
Tsvaga perimeter uchishandisa fomula P = 2 × (a + b):
P \u003d 2 × (20 + 30) \u003d 2 × 50 \u003d 100 (cm).
Mhinduro: P = 100 cm.
