Ответы
Ответ дал:
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r=R*cos(180/n)
R=r/cos(180/n)
R=
/cos22.5
a8=2Rsin(180/n)
a8=
*sin22.5/cos22.5
а8=
tg22.5
![tg22.5= sqrt{(1-cos45)/(1+cos45)} tg22.5= sqrt{(1-cos45)/(1+cos45)}](https://tex.z-dn.net/?f=tg22.5%3D+sqrt%7B%281-cos45%29%2F%281%2Bcos45%29%7D+)
![tg22.5=(2- sqrt{2} )/(2+ sqrt{2}) tg22.5=(2- sqrt{2} )/(2+ sqrt{2})](https://tex.z-dn.net/?f=tg22.5%3D%282-+sqrt%7B2%7D+%29%2F%282%2B+sqrt%7B2%7D%29)
a8=![10 sqrt{3} 10 sqrt{3}](https://tex.z-dn.net/?f=10+sqrt%7B3%7D+)
![(2- sqrt{2} )/(2+ sqrt{2}) (2- sqrt{2} )/(2+ sqrt{2})](https://tex.z-dn.net/?f=%282-+sqrt%7B2%7D+%29%2F%282%2B+sqrt%7B2%7D%29)
S=Pr/2
P=8a=![80 sqrt{3} 80 sqrt{3}](https://tex.z-dn.net/?f=80+sqrt%7B3%7D+)
![(2- sqrt{2} )/(2+ sqrt{2}) (2- sqrt{2} )/(2+ sqrt{2})](https://tex.z-dn.net/?f=%282-+sqrt%7B2%7D+%29%2F%282%2B+sqrt%7B2%7D%29)
S=600
=600![(3-2 sqrt{2} ) (3-2 sqrt{2} )](https://tex.z-dn.net/?f=%283-2+sqrt%7B2%7D+%29)
Ответ : 600![(3-2 sqrt{2} ) (3-2 sqrt{2} )](https://tex.z-dn.net/?f=%283-2+sqrt%7B2%7D+%29)
Удачи в решении задач!
R=r/cos(180/n)
R=
a8=2Rsin(180/n)
a8=
а8=
a8=
S=Pr/2
P=8a=
S=600
Ответ : 600
Удачи в решении задач!
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