Ответ:
1) 13^2 +6^2 - 2*13*6*cos 70°=
169+36-156*cos70°=
205-156*cos70°=151,96
cos70°=0,34
2)13,6^2 +8,8^2 - 2*13,6*8,8*cos125°=
184,96+77,44-239,36*cos125°=
262,4-239,36*cos125°=125,96
Cos 125°=0,57
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Answers & Comments
Ответ:
1) 13^2 +6^2 - 2*13*6*cos 70°=
169+36-156*cos70°=
205-156*cos70°=151,96
cos70°=0,34
2)13,6^2 +8,8^2 - 2*13,6*8,8*cos125°=
184,96+77,44-239,36*cos125°=
262,4-239,36*cos125°=125,96
Cos 125°=0,57