Hauv kev tshaj tawm no, peb yuav txiav txim siab seb lub kaum sab xis yog dab tsi, sau cov duab geometric tseem ceeb uas nws tshwm sim, thiab tseem txheeb xyuas qhov piv txwv ntawm qhov teeb meem ntawm lub ncauj lus no.
Kev txhais ntawm lub kaum sab xis
Lub kaum yog ncaj qhayog tias nws sib npaug 90 degrees.
Hauv cov duab kos, tsis yog ib puag ncig arc yog siv los qhia lub kaum ntse ntse, tab sis ib square.
Lub kaum sab xis yog ib nrab ntawm lub kaum sab xis (180 °) thiab hauv radians yog sib npaug Π / 2.
Cov duab nrog lub kaum sab xis
1. Square – ib lub rhombus, tag nrho cov ces kaum sib npaug zos rau 90 °.
2. Rectangle – ib tug parallelogram, tag nrho cov ces kaum uas yog txoj cai.
3. Ib daim duab peb sab yog ib qho ntawm nws txoj cai kaum.
4. Rectangular trapezoid - tsawg kawg yog ib qho ntawm cov ces kaum yog 90 °.
Piv txwv ntawm qhov teeb meem
Nws yog paub tias nyob rau hauv daim duab peb sab ib tug ntawm cov ces kaum yog txoj cai, thiab lwm yam ob yog sib npaug zos rau ib leeg. Cia peb nrhiav tsis tau qhov tseem ceeb.
tshuaj
Raws li peb paub los ntawm, nws sib npaug 180 °.
Yog li ntawd, ob lub kaum sab xis tsis paub txog 90 °