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luas OAB = √s(s-a)(s-b)(s-c) pakai rumus ini sdh dipelajari di smp lbh cepat
s= 1/2 . keliling segitiga = 1/2( 6x3) = 9
L = √9 ( 9-6)(9-6)(9-6) = √9. 3.3.3 = 3. 3 √3 = 9 √3 = 9 x 1,73 = 15,57 jawaban B