Area of General Quadrilateral Formula=1/2 x diagonals length x (sum of the height of two triangles).
Tus qauv ntawm thaj tsam ntawm plaub fab ABCD yog dab tsi?
Los ntawm daim duab saum toj no, thaj tsam ntawm quadrilateral ABCD=thaj tsam ntawm ΔBCD + cheeb tsam ntawm ΔABD. luas luas ABCD=(1/2) × d × h1 h 1 + (1/2) × d × h2 h 2=(1/2) × d × (h1 + h2 h 1 + h 2).
Yuav ua li cas koj pom thaj tsam ntawm plaub plaub sab nrog 4 sab?
Piv txwv: Hauv ib lub voj voos kab pheeb ces kaum yog 42 cm thiab ob qhov perpendiculars ntawm nws los ntawm lwm qhov vertices yog 8 cm thiab 9 cm feem. Nrhiav thaj tsam ntawm lub quadrilateral. Luas=12 x 9 x 42 + 12 x 8 x 42=189 + 168=357 m².
Yuav ua li cas koj suav thaj tsam ntawm qhov tsis sib xws plaub ntug?
Txhawm rau nrhiav thaj tsam ntawm cov plaub hau tsis xwm yeem, ua raws li peb kauj ruam lub tswv yim:
- Faib cov plaub fab rau hauv ob daim duab peb sab los ntawm kev tsim ib kab pheeb ces kaum uas tsis cuam tshuam lub kaum sab hauv paub.
- Xaiv thaj tsam ntawm txhua daim duab peb sab, siv cov qauv.
- Ntxiv cov cheeb tsam ntawm ob daim duab peb sab.
Koj nrhiav thaj chaw li cas?
Yuav kom pom thaj tsam ntawm ib daim duab plaub, muab nws qhov siab los ntawm nws qhov dav. Rau ib lub square koj tsuas yog yuav tsum nrhiav qhov ntev ntawm ib sab (raws li txhua sab yog tib qhov ntev) thiab muab qhov no los ntawm nws tus kheej kom pom thaj tsam.
