sin(B) = 4/c
sin(30) =4/c
1/2 = 4/c
c = 8
A = 90-B
cos(A) = cos(90-B) = sin(B)
cos(A) = 4/c
= 4/8
cos(A) = 1/2
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sin(B) = 4/c
sin(30) =4/c
1/2 = 4/c
c = 8
A = 90-B
cos(A) = cos(90-B) = sin(B)
cos(A) = 4/c
= 4/8
cos(A) = 1/2