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irina2001375
@irina2001375
October 2021
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Ответьте подробно , СРОЧНО
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NeZeRAvix
Verified answer
,.,.,.,.,.,.,.,..,....
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sedinalana
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1
AB=5см,AC=16см,<A=120
BC²=AB²+AC²-2AB*AC*cosA
BC²=25+256-2*5*16*(-1/2)=281+80=361
BC=19см
2
AB=7√2см,AD=17см,<A=45
S=AD*AB*sinA=7√2*17*√2/2=119см²
<B=180-<A=180-45=135
AC²=AB²+BC²-2AB*BC*cosB
AC²=98+289-2*7√2*14*(-√2/2)=98+289+238=625
AC=25см
3
АВ=20cм,ВС=10√3см,<B=30
AC²=AB²+BC²-2AB*BC*cosB
AC²=400+300-2*20*10√3*√3/2=700-600=100
AC=10см
AC/sinB=AB/sinC
sinC=AB*sinB/AC
sinC=20*0,5/10=1
<C=90
<A=180-(<B+<C)=1/0-(90+30)=60
0 votes
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Answers & Comments
Verified answer
,.,.,.,.,.,.,.,..,....Verified answer
1AB=5см,AC=16см,<A=120
BC²=AB²+AC²-2AB*AC*cosA
BC²=25+256-2*5*16*(-1/2)=281+80=361
BC=19см
2
AB=7√2см,AD=17см,<A=45
S=AD*AB*sinA=7√2*17*√2/2=119см²
<B=180-<A=180-45=135
AC²=AB²+BC²-2AB*BC*cosB
AC²=98+289-2*7√2*14*(-√2/2)=98+289+238=625
AC=25см
3
АВ=20cм,ВС=10√3см,<B=30
AC²=AB²+BC²-2AB*BC*cosB
AC²=400+300-2*20*10√3*√3/2=700-600=100
AC=10см
AC/sinB=AB/sinC
sinC=AB*sinB/AC
sinC=20*0,5/10=1
<C=90
<A=180-(<B+<C)=1/0-(90+30)=60