헤론의 공식(비교)보기RAWBlame되돌리기비교r14 vs r15......2828식을 풀면29293030[math(\displaystyle \begin{aligned} \dfrac{1}{4a^{2}}(a+b+c)(a+c-b)(a+b-c)(b+c-a) \end{aligned})],3131[math(\displaystyle \begin{aligned} \dfrac{1}{4a^{2}}\cdot 2s \cdot 2(s-b)\cdot 2(s-c)\cdot 2(s-a) \end{aligned})],