Answer and Explanation
Your Answer is
Correct Answer is D
Explanation
a²=b²+c²-2bc cosA,
l² = 120² + 80² - 2×120×80 (-0.6)
l² = 32320
< p>l ≈ 180Your Answer is
Correct Answer is D
Explanation
a²=b²+c²-2bc cosA,
l² = 120² + 80² - 2×120×80 (-0.6)
l² = 32320
< p>l ≈ 180