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Nadianew
@Nadianew
July 2022
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Допоможіть, будь ласка
№690,693,694
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sedinalana
Verified answer
690
ABCD-прямоугольник
AC=65,<CAD=65
AB=CD=AC*sin65≈65*0,9063≈58,9
BC=AD=AC*cos65≈65*0,4226≈27,5
693
AC/AB=7/8
cosB=(AB²+BC²-AC²)/2AB*BC=(49+49-64)/(2*7*7)=34/98≈0,3469
<B=69гр42мин
<A=<C=(180гр-69гр 42мин):2=55гр 9мин
694
AB=BC,BH=AC
AH=1/2=AC=1/2BH
tgA=tgC=BH/(0,5BH)=2⇒<A=<C≈63гр 30мин
<B=180-2<A=180-127=53
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Answers & Comments
Verified answer
690ABCD-прямоугольник
AC=65,<CAD=65
AB=CD=AC*sin65≈65*0,9063≈58,9
BC=AD=AC*cos65≈65*0,4226≈27,5
693
AC/AB=7/8
cosB=(AB²+BC²-AC²)/2AB*BC=(49+49-64)/(2*7*7)=34/98≈0,3469
<B=69гр42мин
<A=<C=(180гр-69гр 42мин):2=55гр 9мин
694
AB=BC,BH=AC
AH=1/2=AC=1/2BH
tgA=tgC=BH/(0,5BH)=2⇒<A=<C≈63гр 30мин
<B=180-2<A=180-127=53