Ответ:
ABC=A¹B¹C¹
A¹C¹^2=A¹B¹^2+B¹C¹^2-2AB*BC*cosA¹B¹C¹
A¹C¹^2=64+49-2*8*7*(-1/2)=113+56=169
A¹C¹=13
P=8+7+13=28
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Ответ:
ABC=A¹B¹C¹
A¹C¹^2=A¹B¹^2+B¹C¹^2-2AB*BC*cosA¹B¹C¹
A¹C¹^2=64+49-2*8*7*(-1/2)=113+56=169
A¹C¹=13
P=8+7+13=28