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Gre4nikov [31]
3 years ago
11

Work out the size of angle A

Mathematics
2 answers:
ExtremeBDS [4]3 years ago
5 0

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

vovikov84 [41]3 years ago
3 0

Answer:

the angle will be b because it going down in to a angle

Step-by-step explanation:

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