Ответ:
a) <A=60, <B=40, c=14
БС=180-40-60=80
AB/SinC=BC/SinA=AC/SinB
14/Sin80=BC/Sin60=AC/Sin40
14/0.9848=BC/0.8660=AC/0.6428
14/0.9848=BC/0.8660 => BC=14*0.8660/0.9848=12.3
14/0.9848=AC/0.6428 => AC=14*0.6828/0.9848=9.1
б) a=6.3, b=6.3, <C=54
c^2=a^2+b^2-2*a*b*CosC=6.3^2+6.3^2-2*6.3*6.3*Cos54=39.69+39.69-79.38*0.5878= 79.38-46.659564=32.720436=5.7
a=b =6.3 => <A=<B=(180-54)/2=126/2=63
Объяснение:
всё легко
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
Ответ:
a) <A=60, <B=40, c=14
БС=180-40-60=80
AB/SinC=BC/SinA=AC/SinB
14/Sin80=BC/Sin60=AC/Sin40
14/0.9848=BC/0.8660=AC/0.6428
14/0.9848=BC/0.8660 => BC=14*0.8660/0.9848=12.3
14/0.9848=AC/0.6428 => AC=14*0.6828/0.9848=9.1
б) a=6.3, b=6.3, <C=54
c^2=a^2+b^2-2*a*b*CosC=6.3^2+6.3^2-2*6.3*6.3*Cos54=39.69+39.69-79.38*0.5878= 79.38-46.659564=32.720436=5.7
a=b =6.3 => <A=<B=(180-54)/2=126/2=63
Объяснение:
всё легко