According to Heron's formula,the area of a triangle $=$ .........
- A$\sqrt{s(s-a)(s-b)(s-c)}$
- B$\sqrt{(s-a)(s-b)(s-c)}$
- C$\sqrt{(s+a)(s+b)(s+c)}$
- D$\sqrt{s(s+a)(s+b)(s+c)}$
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