gunakan hukum cosinus.
(2√7)^2 = 6^2 + 2^2 - 2(6)(2)cos A
28 = 36 + 4 - 24 cos A
24 cos A = 12
cos A = 1 / 2
buat segitiha siku siku baru dengan cos A = 1/2
sisi depannya = √(2^2 - 1^2) = √3
sin A = depan / miring
sin A = √3 / 2 (B)
semoga membantu :)
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gunakan hukum cosinus.
(2√7)^2 = 6^2 + 2^2 - 2(6)(2)cos A
28 = 36 + 4 - 24 cos A
24 cos A = 12
cos A = 1 / 2
buat segitiha siku siku baru dengan cos A = 1/2
sisi depannya = √(2^2 - 1^2) = √3
sin A = depan / miring
sin A = √3 / 2 (B)
semoga membantu :)