Hi all,(adsbygoogle = window.adsbygoogle || []).push({});

I'm a newbie here and sorry for my bad English.

I wanna 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 have:(a+b+c)^2 >= S*12*(3^0.5)

Did anyone know these before? If didn't, please reply to me.

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# I've created some new formulas in trigonometry! (perhaps)

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