Yog, lub hypotenuse yog ib txwm yog sab ntev tshaj, tab sis tsuas yog rau txoj cai kaum sab xis. Rau cov duab peb sab isosceles, ob sab sib npaug yog hu ua ob txhais ceg, thaum nyob rau hauv daim duab peb sab sib npaug txhua sab yog paub yooj yim li ob sab.
qhov twg yog qhov hypotenuse ntawm daim duab peb sab?
"Hypotenuse" tsuas yog ib lo lus uas txhais tau tias "qhov ntev tshaj plaws ntawm daim duab peb sab." Lub hypotenuse yog sab nraud ntawm lub kaum sab xis hauv daim duab peb sab. Nws tseem yog sab ntev tshaj ntawm daim duab peb sab.
Yuav ua li cas koj pom qhov ploj ntawm daim duab peb sab isosceles?
txhawm rau nrhiav ib sab tsis paub ntawm daim duab peb sab, koj yuav tsum paub qhov ntev ntawm ob sab thiab / lossis qhov siab. Txhawm rau nrhiav tsis tau lub hauv paus ntawm daim duab peb sab isosceles, siv cov qauv hauv qab no: 2sqrt(L^2 - A^2), qhov L yog qhov ntev ntawm ob txhais ceg thiab A. yog qhov siab ntawm daim duab peb sab.
Yuav ua li cas koj pom qhov ntev ntawm lub hypotenuse ntawm lub isosceles txoj cai peb sab los ntawm qhov ntev ntawm ob txhais ceg?
Ib qho isosceles txoj kab peb sab yog daim duab peb sab isosceles thiab daim duab peb sab. Qhov no txhais tau hais tias nws muaj ob sab sib koom ua ke thiab ib lub kaum sab xis. Yog li ntawd, ob sab congruent yuav tsum yog ob txhais ceg. Los ntawm qhov no peb tuaj yeem xaus tias qhov ntev hypotenuse yog qhov ntev ntawm ib ceg muab faib los ntawm \begin{align}\sqrt{2}\end{align}
Koj pom qhov ntev ntawm daim duab peb sab isosceles li cas?
Nyob hauv ib daim duab peb sab isosceles, cov sab sib npaug ua rau lub kaum sab xis. Lawv muaj qhov sib npaug ntawm qhov sib npaug, 1: 1. Txhawm rau nrhiav tus lej piv ntawm lub hypotenuse h, peb muaj, raws li Pythagorean theorem, h 2=1 2 + 12=2.
