Pob zeb diamond yog plaub lub duab plaub sib npaug nrog plaub sab sib npaug. Muaj peb tus qauv siv los nrhiav thaj tsam ntawm pob zeb diamond. Yog tias koj xav ntsib lawv, ua raws Cov Kauj Ruam no.
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 lub pob zeb diamond yog cov kab uas txuas cov kab rov tav (cov ces kaum) ntawm cov duab. Lawv yog perpendicular thiab ua plaub txoj cai peb tog raws 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 cov kev ntsuas sib npaug rau qhov ntev ntawm txhua kab pheeb ces kaum thiab muab lawv sib npaug. Hauv qhov no, 6 cm × 8 cm = 48 cm2. Tsis txhob hnov qab txog cov chav nyob raws li peb tab tom ua haujlwm nrog cov chav nyob.
Kauj Ruam 3. Muab cov txiaj ntsig faib ua 2
Txij li 6 cm × 8 cm = 48 cm2, tsuas yog faib qhov txiaj ntsig los ntawm 2.48 cm2 / 2 = 24 cm ntev2. Yog li ntawd, thaj tsam ntawm pob zeb diamond sib npaug li 24 cm2.
Txoj Kev 2 ntawm 3: Siv Lub Hauv Paus thiab Qhov Siab
Kauj Ruam 1. Tshawb xyuas lub hauv paus ntev thiab qhov siab
Koj tuaj yeem xav txog cov txheej txheem no ua kom sib npaug sib npaug qhov siab ntawm ib sab ntawm pob zeb diamond. Cia peb hais tias qhov siab no sib npaug 7 cm thiab lub hauv paus sib npaug 10 cm.
Kauj Ruam 2. Muab lub hauv paus thiab qhov siab
Thaum koj paub lub hauv paus thiab qhov siab ntawm lub pob zeb diamond, koj tsuas yog yuav tsum tau muab lawv txhawm rau nrhiav thaj chaw zoo nkauj. Yog li, 10 cm × 7 cm = 70 cm2. Vim li ntawd, thaj tsam pob zeb diamond sib npaug li 70 cm2.
Txoj Kev 3 ntawm 3: Siv Trigonometry
Kauj Ruam 1. Txiav qhov ntsuas ntawm ob sab
Pob zeb diamond muaj plaub sab sib luag, yog li nws tsis muaj teeb meem twg koj xaiv. Cia peb hais tias sab muaj qhov ntsuas sib npaug li 2 cm. 2 cm × 2 cm = 4 cm2.
Kauj Ruam 2. Muab cov txiaj ntsig los ntawm sine ntawm ib qho ntawm cov ces kaum
Txawm hais tias koj xaiv sab twg, cia peb hais ib qho ntawm cov ces kaum sib npaug li 33 degrees. Tsuas yog sib npaug sine (33) los ntawm 4 cm2 kom tau txais thaj tsam pob zeb diamond. (2 cm)2 × sine (33) = 4 cm2 × 1 = 4 cm2. Lub pob zeb diamond thaj tsam yog 4 cm2.