Câu 30: Cho tam giác ABC có AB=3, BC =5,C4=6. Diện tích tam giác ABC là
A. 56.
B. 2$\sqrt{14}$
C. 6.
D. 36.
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Ta có: `p=(AB+BC+CA)/2=7`
`=>` `S_(DeltaABC)=sqrt(p(p-AB)(p-BC)(p-CA))=2sqrt14` (Hê-rông)
`=>` Chọn `B`