Verified answer

Ответ:

0.894

Объяснение:

CP=√((3-1)²+(1+1)²)=√8

PM=√((7-3)²+(3+1)²)=√32

CM=√((7-1)²+(3-1)²)=√40

CP²=PM²+CM²-2*PM*CM*cosα  (теорема косинусов)

cosα=(PM²+CM²-CP²)/(2*PM*CM)=(32+40-8)/(2*√32*√40)=0.894

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