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anonymous
 one year ago
A triangle has side lengths of 9 in, 13 in, and 20 in. What is the measurement of this triangle’s largest angle?
29.9°
50.1°
129.9°
136.2°
anonymous
 one year ago
A triangle has side lengths of 9 in, 13 in, and 20 in. What is the measurement of this triangle’s largest angle? 29.9° 50.1° 129.9° 136.2°

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wolf1728
 one year ago
Best ResponseYou've already chosen the best response.0When we know all 3 sides, we use the Law of Cosines: The largest side is 20 so C is the largest angle cos(C) = (a^2 + b^2 c^2) / (2*a*b) cos (C) = (9^2 + 13^2 20^2)/ =2*9*13 cos (C) = (81 + 169 400) / 234 cos (C) = 150 / 234 cos (C) = 0.641025641 The arc cosine of 0.641025641 is 129.87 Degrees
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