√s*(s-a)*(s-b)*(s-c) 请问大家这个数学公式是求什么的?

√s*(s-a)*(s-b)*(s-c) 请问大家这个数学公式是求什么的? A.S.S.S.B.S.A.S.C.A.S.A.DA. S.S.S. B. S.A.S. C. A.S.A. D.A.A.S. 选哪一个 海伦公式S=√ [s(s-a)(s-b)(s-c)] 前面有个勾 代表什么意思! area=√{s(s-a)(s-b)(s-c)},其中s=(a+b+c)/2.求C语言表达式 a =sqrt((s*(s-a)*(s-b)*(s-c)));错在哪里 a b c s× 9---------s c b a求a b c s各是多少 ___hot and sunny.__no wind.A.It's...There's B.Today's...It's C.There's...It's D.It's...It's ______Tom’s sister . A.He's B.His C.That’s D.This’s 2、Where’s John?.A:He’s sleeping.B:She’s sleeping.C:He’s sleep. 已知三角形ABC的三条鞭分别为a,b,c求证：S三角形=sqrt(s(s-a)(s-b)(s-c)),s=(a+b+c)/2 whose name is a flower?it's-------.A.Mary's B.Jenny's C.Helen's D.Rose's what's this?A.It's here B.It's the letter S C .its S D.It's a S 应该选哪一个 Where's ______?A.Tom's pants B.Tom's pen's C.Tom's pen D.pen of Tom 利用余弦定理证明海伦公式S=√[s(s-a)(s-b)(s-c)].其中a,b,c为三角形三边,S为三角形面积,s为半周长. s s s (s)