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ab² = ac² + bc² -2acxbc cos C
6²=10²+12²-2x10x12 cosC
36=100+144-240CosC
240CosC=208
cosC=208/240
Luas ABC =√s(s-a)(s-b)(s-c)
s=6+20+12)/2= 38/2=19
Luas ABC=√19(13)(9)(7)=√15561