Recent content by man_fire

Hello Arildno, I didn't use Heron's formula in deriving 2). Here is my solvation: cotang(A/2) + cotang(B/2) + cotang(C/2) >= 3*cotang((A+B+C)/6)=3*3^(1/2) and: cotang(A/2) = cos(A/2) / sin(A/2). We multiply both numerator and denominator with 2cos(A/2). Simply numerator = 1+cosA, and...

Hello Vance, You're a genius because you've found out a better way to get the result than I have. I brought that form up from: S=abc/4R and: S=0.5*absinC. It's so messy. Thanks for your consideration.

Hi all, I'm a newbie here and sorry for my bad English. I want to share with you guys 2 formulas I've created luckily on a boring day: 1) Let R be circumscribed circle of triangle ABC, let S be it's area. We have: S=2R^2*sinAsinBsinC 2)Let S be area of triangle ABC, a=BC, b=CA, c=AB. We...