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24-03-2017
Mathematics

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Given: ΔABC; b= 10; c = 14, and ∠A = 54°. Find the length of side a to the nearest whole number.

A) 9
B) 12
C) 15
D) 17

Respuesta :

25-03-2017

a² = b² + c² - 2bc cosA
a² = 10² + 14² - 2*10*14 cos54
a² = 100 + 196 - 280 * cos54
a = [tex] \sqrt{100 + 196 - 280 * cos54} [/tex]
a = 11.46

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