a^2 = b^2 + c^2 - 2bc cos A
28 = 16 + 36 - 48 cos A
28 = 52 - 48 cos A
48 cos A = 24
cos A = 0.5
A = 60°
=> sin 60 = 0.5√3 (C)
semoga membantu :)
a² = b²+c²-2bc cosA
(2√7)² = 4²+6²-2(4)(6)cosA
28 = 16+36-48cosA
-48cosA = 28-52
cosA = 1/2
cosA = cos60
//maka//
A = 60
sin60 = √3/2
Jawabannya C
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a^2 = b^2 + c^2 - 2bc cos A
28 = 16 + 36 - 48 cos A
28 = 52 - 48 cos A
48 cos A = 24
cos A = 0.5
A = 60°
=> sin 60 = 0.5√3 (C)
semoga membantu :)
a² = b²+c²-2bc cosA
(2√7)² = 4²+6²-2(4)(6)cosA
28 = 16+36-48cosA
-48cosA = 28-52
cosA = 1/2
cosA = cos60
//maka//
A = 60
sin60 = √3/2
Jawabannya C