Kev txhaum 45 txhais li cas?
Kev txhaum 45 txhais li cas?

Video: Kev txhaum 45 txhais li cas?

Video: Kev txhaum 45 txhais li cas?
Video: Qhia daws kev npam kev txhaum 2024, Hlis ntuj nqeg
Anonim

Sin 45 Qib. Sine muaj nuj nqi txhais tau tias muaj kev sib raug zoo ntawm lub kaum sab xis ntawm lub kaum sab xis ntawm lub kaum sab xis thiab sab nraud rau lub kaum sab xis thiab hypotenuse. Los yog koj ua tau hais tias, Sine ntawm lub kaum sab xis α yog sib npaug rau qhov sib piv ntawm sab nraud (perpendicular) thiab hypotenuse ntawm lub kaum sab xis ntawm daim duab peb sab.

Hauv qhov no, dab tsi yog kev txhaum 45 degrees hauv feem?

Lub sine yog txhais raws li qhov piv ntawm qhov tawm tsam sab thiab lub hypothenuse. Yog li ntawd, sib 45 o = 1 √2 = √22. Hauv daim ntawv decimal, nws yog kwv yees li 0.7071067812.

Tsis tas li ntawd, tus nqi ntawm kev txhaum 45 cos 45 yog dab tsi? Qhov tseeb tus nqi ntawm kev txhaum ( 45 ) kev txhaum ( 45 ) yog √22 2 2. Qhov tseeb tus nqi ntawm cos ( 45 ) cos ( 45 ) yog √22 2 2. Simplify cov ntsiab lus.

Yog li ntawd, puas yog sin 45 thiab cos 45 tib yam?

Hauv ob qho xwm txheej, cov cosine yog lub sine ntawm lub complementary lub kaum sab xis. Nyob rau hauv tas li ntawd, 30 degrees thiab 60 degrees yog ntxiv cov ces kaum, yog li cov cosine ntawm ib tug yog lub txim ntawm lwm tus. Hauv qhov no, 45 degree thiab 45 degrees yog complementary ces kaum cosine ntawm ib tug yog lub txim ntawm lwm tus.

Lub cim ntawm 45 degrees yog dab tsi?

Lub kaum sab xis tseem ceeb: 30 °, 45 ° thiab 60 °

Lub kaum sab xis Tan = Sin/Cos
30° 1 √3 = √3 3
45° 1
60° √3

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