Answer: 12) 34° 13) 90°
<u>Step-by-step explanation:</u>
12) Given: a = 10.2, b = 6.8, A = 122°
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Law of Cosines: a² = b² + c² - 2bc · cos A
<em>Note: The letters can be swapped</em>
13) Given: a = 3, b = 4, c = 5, C = ???
3² = 4² + 5² - 2(4)(5) · cos C
9 = 16 + 25 - 40 cos C
9 = 41 - 40 cos C
-32 = -40 cos C
0.8 = cos C
90° = C
Answer:
6,428
Step-by-step explanation:
solo usa una calculadora o una hoja de papel
Espero que esto te ayude y que tengas un gran dia.
The answer for this question is 7.