Odpowiedź:
a = 5 b = 14 c = 15
Z tw. kosinusów mamy
5² = 14² + 15² - 2*14*15*cos α
420 cos α = 196 + 225 - 25 = 396 / : 420
cos α =
=====================
14² = 15² + 5² - 2*15*5*cos β
150*cos β = 225 + 25 - 196 = 54/ : 150
cos β =
==================
15² = 14² + 5² - 2*14*5*cos √
140 cos √ = 196 + 25 - 225 = - 4 / : 140
cos √ = -
Szczegółowe wyjaśnienie:
a² = b² + c² - 2 a*b*cos α tw. kosinusów
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Odpowiedź:
a = 5 b = 14 c = 15
Z tw. kosinusów mamy
5² = 14² + 15² - 2*14*15*cos α
420 cos α = 196 + 225 - 25 = 396 / : 420
cos α =
=====================
14² = 15² + 5² - 2*15*5*cos β
150*cos β = 225 + 25 - 196 = 54/ : 150
cos β =
==================
15² = 14² + 5² - 2*14*5*cos √
140 cos √ = 196 + 25 - 225 = - 4 / : 140
cos √ = -
==================
Szczegółowe wyjaśnienie:
a² = b² + c² - 2 a*b*cos α tw. kosinusów
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