Video: Cov kaum sab xis puas tuaj yeem ntxiv?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov ces kaum ntxiv yog ob lub kaum sab xis nws qhov sum yog 180 degrees thaum cov ces kaum sib ntxiv yog ob lub kaum sab xis nws qhov sum yog 90 degrees. Ntxiv thiab complementary ces kaum ua Tsis tas yuav tsum nyob ib sab (sib koom lub vertex thiab sab, lossis ib sab), tab sis lawv ua tau ua.
Tsis tas li ntawd, ua li cas koj thiaj nrhiav tau cov ces kaum sib ntxiv thiab ntxiv?
Cov kaum sab xis ntxiv tsim txoj cai lub kaum sab xis (L duab) thiab muaj qhov sib npaug ntawm 90 degrees. Cov ces kaum ntxiv tsim ib txoj kab ncaj nraim thiab muaj qhov sib npaug ntawm 180 degrees. Yog tias qhov kev sib raug zoo tau muab, koj tuaj yeem rho tawm qhov muab lub kaum sab xis los ntawm cov lej los txiav txim qhov ntsuas ntawm qhov ploj lawm lub kaum sab xis.
Qhov thib ob, qhov twg lub kaum sab xis yog ntxiv? Cov ces kaum ntxiv yog ob qho tib si lub kaum sab xis nws ntsuas sum rau 180 degrees. Ntxiv lub kaum sab xis yuav yog ob txoj cai lub kaum sab xis (ob leeg 90 degrees) los yog ib qho mob lub kaum sab xis thiab ib tug obtuse lub kaum sab xis . Yog ob lub kaum sab xis yog ob leeg ntxiv mus rau qhov qub lub kaum sab xis , ces ob lub kaum sab xis yog qhov sib npaug.
Tsuas yog li ntawd, cov kaum sab xis puas ntxiv lossis ntxiv?
Lus txhais: Cov kaum sab xis ntxiv yog ob lub kaum sab xis nrog 90º. Cov ces kaum ntxiv yog ob lub kaum sab xis nrog qhov sib npaug ntawm 180º. Vertical angles yog ob lub kaum sab xis nws sab tsim ob khub ntawm opposite rays.
Puas ntxiv cov ces kaum yuav tsum txuas?
Ntxiv thiab Complementary Angles . Qee zaum, ob cov ces kaum yog ib feem ntawm ib leeg los yog txuas nrog rau ib leeg. Ob tug no cov ces kaum yog ntxiv vim ua ke lawv tsim ib txoj kab ncaj nraim. Koj ua tau kuj qhia rau lawv yog supplementary vim thaum koj ntxiv lawv lub kaum sab xis ntsuas qhov sum yog sib npaug rau 180 degrees.
Pom zoo:
Cov kab lus hloov sab hauv cov ces kaum piav qhia txoj haujlwm ntawm ob lub kaum sab xis li cas?
Hloov sab hauv cov ces kaum yog tsim los ntawm ib tug transversal intersecting ob parallel kab. Lawv nyob nruab nrab ntawm ob qho tib si kab tab sis nyob rau sab nraud ntawm lub transversal, tsim ob khub (plaub tag nrho cov ces kaum) ntawm cov ces kaum sab hauv. Hloov cov ces kaum sab hauv yog congruent, txhais tau tias lawv muaj qhov sib npaug
Koj tuaj yeem ua pov thawj li cas 2 daim duab peb sab zoo sib xws siv lub kaum sab xis sab SAS zoo sib xws postulate?
SAS Similarity Theorem hais tias yog ob sab hauv ib daim duab peb sab yog proportional rau ob sab hauv lwm daim duab peb sab thiab lub kaum sab xis nyob rau hauv ob qho tib si congruent, ces ob daim duab peb sab zoo ib yam. Ib qho kev hloov pauv zoo sib xws yog ib lossis ntau qhov kev hloov pauv tsis tu ncua ua raws li kev dilation
Puas yog cov kaum sab xis hauv ib daim duab peb sab isosceles ib txwm ntsuas 45?
Hauv ib daim duab peb sab isosceles, qhov sib npaug sab ua rau lub kaum sab xis. Nco ntsoov tias vim txoj cai daim duab peb sab yog isosceles, ces cov ces kaum ntawm lub hauv paus yog sib npaug. (Theorem 3.) Yog li ntawd txhua lub kaum sab xis yog 45 °
Puas yog tib sab sab nrauv cov ces kaum ntxiv?
Ob lub kaum sab nrauv sab nrauv rau cov kab sib txuas thiab ntawm tib sab ntawm txoj kab transversal yog hu ua tib-sab sab nrauv cov ces kaum. Lub theorem hais tias tib lub sab sab nrauv cov ces kaum yog ntxiv, txhais tau tias lawv muaj qhov sib npaug ntawm 180 degrees
Dab tsi yog kev sib raug zoo ntawm sab nrauv thiab sab hauv lub kaum sab xis ntawm daim duab peb sab?
Cov kaum sab hauv yog hu ua Sab hauv cov ces kaum. Cov lej ntawm cov kaum sab hauv ntawm daim duab peb sab yog ib txwm 180 degrees. Lub kaum sab nrauv yog lub kaum sab xis ntawm ib sab ntawm ib qho duab, thiab ib txoj kab txuas ntxiv los ntawm sab tom ntej. Qhov sib npaug ntawm lub kaum sab nrauv thiab nws lub kaum sab hauv uas nyob ib sab kuj yog 180 degrees