sanax16 sanax16

15-10-2020
Mathematics

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Work out the size of angle A

Work out the size of angle A class=

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Аноним Аноним

23-10-2020

Answer:

27.63

Step-by-step explanation:

a² = b²+c² - 2bcCos(A)

a² = 11² + 9² - 2 x 11 x 9 x cos(38)

a = BC = 6.78

sin(A)/a = Sin(B)/b

sin(A)/6.78 = Sin(38)/9

sin(A) = Sin(38) x 6.78 / 9

sin(A ) = 0.463

SIn-1(0.463) = 27.63

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