Sophiapaz1
Sophiapaz1 Sophiapaz1
  • 03-07-2019
  • Mathematics
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Find BC please in the picture

Find BC please in the picture class=

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aguilerapablo03
aguilerapablo03 aguilerapablo03
  • 03-07-2019

B. 25 Km. The measure of BC is 25 km.

The easiest way to solve this problem is using the cosine theorem c = √a²+b²-2ab*cos A.

BC = √AC²+AB²-2(AC)(AB)*cos A

BC = √(21km)²+(14km)²-2(21km)(14km)*cos 89°

BC = √441km²+196km²-588km²*(0.017)

BC =√637km²-10.26km²

BC = √636.74km²

BC = 25.03km ≅ 25

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