Lub rhombus yog daim duab plaub nrog plaub sab sib dhos. Nws tsis tas yuav muaj txoj cai kaum. Muaj peb tus qauv rau nrhiav thaj tsam ntawm rhombus. Tsuas yog ua raws cov theem no yog tias koj xav paub yuav ua li cas.
Cov kauj ruam
Txoj Kev 1 ntawm 3: Siv Diagonals
Kauj Ruam 1. Nrhiav qhov ntev ntawm txhua kab pheeb ces kaum
Cov kab pheeb ces kaum ntawm ib lub rhombus yog cov kab uas txuas cov kab rov tav (cov ces kaum) nyob hauv nruab nrab ntawm cov duab. Cov kab pheeb ces kaum ntawm ib lub rhombus yog qhov sib dhos thiab tsim plaub txoj cai peb tog los ntawm lawv txoj kev sib tshuam.
Wb hais tias kab pheeb ces kaum yog 6 cm. thiab 8 cm. ntev
Kauj Ruam 2. Muab qhov ntev ntawm kab pheeb ces kaum
Tsuas yog sau qhov ntev ntawm kab pheeb ces kaum thiab muab lawv sib npaug. Hauv qhov no, 6 cm x 8 cm = 48 cm2. Tsis txhob hnov qab kom faib cov chav nyob vim tias koj tab tom ua haujlwm hauv cov chav square.
Kauj Ruam 3. Muab cov txiaj ntsig faib ua 2
Txij li 6 cm x 8 cm = 48 cm2, tsuas yog faib qhov txiaj ntsig los ntawm 2. 48 cm2/2 = 24 cm ntev2. Lub cheeb tsam ntawm rhombus yog 24 cm2.
Txoj Kev 2 ntawm 3: Siv Lub Hauv Paus thiab Qhov Siab
Kauj Ruam 1. Nrhiav lub hauv paus thiab qhov siab
Koj kuj tseem tuaj yeem xav txog qhov no sib npaug qhov siab ntawm rhombus nrog qhov ntev ntawm ib sab ntawm rhombus. Cia peb hais qhov siab ntawm rhombus yog 7 cm thiab lub hauv paus yog 10 cm.
Kauj Ruam 2. Muab lub hauv paus thiab qhov siab
Thaum koj paub lub hauv paus thiab qhov siab ntawm rhombus, txhua yam koj yuav tsum tau ua txhawm rau nrhiav thaj tsam ntawm cov duab yog los ua kom lawv sib npaug. Yog li, 10 cm x 7 cm = 70 cm2. Lub cheeb tsam ntawm rhombus yog 70 cm2.
Txoj Kev 3 ntawm 3: Siv Trigonometry
Kauj Ruam 1. Txiav qhov ntev ntawm ib sab
Ib lub rhombus muaj plaub sab sib luag, yog li nws tsis muaj teeb meem twg koj xaiv. Wb hais tias sab yog ntev 2 cm. 2 cm x 2 cm = 4 cm2.
Kauj Ruam 2. Muab nws los ntawm sine ntawm ib qho ntawm cov ces kaum
Nws tsis txawv qhov twg koj xaiv. Cia peb hais tias ib qho ntawm lub kaum sab xis yog 33 degrees. Tsuas yog sib npaug sine (33) los ntawm 4 cm2 kom tau txais thaj tsam ntawm rhombus. (2 cm)2 x sine (33) = 4 cm2 x 0.55 = 2.2 cm2. Lub cheeb tsam ntawm rhombus yog 2.2 cm2.