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5,4 / (sin 70°) = c/(sin 80°)
5,4 / 0,9 = c/(1,0)
6 = c
------- = -------
sin b sin c
5,4 c
--------- = --------
sin 70 sin 80
5,4 c
--------- = -------
0,9 1
5,4 x 1
c = -----------
0,9
c = 6 cm
Jadi panjang sisi c = 6 cm
semoga jelas dan membantu ya