Heros Formular Share on NP

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Heros formular this is a formular use to calculate all Angle of triangle sofar all the three side are given. i.e a,b,c. His formular was formed by me Adeyemi when i was in the school my teacher who teaches me futher maths try it and it was ok. the formular was Square root of S(a)+S(b)+S(c). Any one