Mathematics, 19.07.2019 04:00 babyari18
Atriangle has side lengths 4, 7 and 9. what is the measure of the angle across from the longest side? 92 = 42 + 72 − 2g4g7cos(a) 81 = 16 + 49 − 56cos(a) 81 = 9cos(a) 9 = cos(a) a cannot exist! gabe tried to use the law of cosines to find an unknown angle measure in a triangle. his work is shown. what is gabe’s error? gabe reversed the order of the 9 and the 4. gabe squared the numbers incorrectly. gabe should not have subtracted 56 from 16 + 49. gabe incorrectly stated that cos–1(9) is not defined.
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Atriangle has side lengths 4, 7 and 9. what is the measure of the angle across from the longest side...
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