tatermadison
14.01.2020 •
Mathematics
Suppose a triangle has two sides of length 2 and 3 and that angle between these two sides is 60 degrees. what is the length of the third side
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Ответ:
Apply cosine rule:
c²=b²+a²-2ba cosC
C= pi/3 = 180/3 = 60 degrees
cosine 60 deg = 0.5
c²=2²+3²-[2×2×3×0.5]
c²=7
c=√7
c=2.645 ;length of third side of angle
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