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bisa
1/2 x alas x tinggi
1/2 x bc x sin A
1/2 x ac x sin B
1/2 x ab x sin C
atau rumus heron
L = akar ( s (s-a)(s-b)(s-c)
s= 1/2 ( a+b+c )
atau
L = a kuadrat sin B sin C
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2 sin A
L = b kuadrat sin A sin C
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2 sin B
L = c kuadrat sin A sin B
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2 sin C
semoga membantu gan :v