Question Number 211609 by MATHEMATICSAM last updated on 14/Sep/24

Answered by Frix last updated on 14/Sep/24
![We know a^2 +b^2 −2abcos γ =c^2 ⇔ cos γ =((a^2 +b^2 −c^2 )/(2ab)) ⇒ sin γ =(√(1−cos^2 γ))= =((√((a+b+c)(a+b−c)(a+c−b)(b+c−a)))/(2ab))= =(δ/(2ab)) ⇒ sin α =(δ/(2bc))∧sin β =(δ/(2ac)) ⇒ (a/(sin α))=(b/(sin β))=(c/(sin γ))=((2abc)/δ)=((abc)/(2A)) [The area of the triangle is A=(δ/4)] The radius of the circumcircle is R=(a/(2sin α))=(b/(2sin β))=(c/(2sin γ))=((abc)/δ)=((abc)/(4A))](https://www.tinkutara.com/question/Q211618.png)
Answered by mr W last updated on 14/Sep/24

Commented by mr W last updated on 14/Sep/24

Commented by Ari last updated on 16/Sep/24

Commented by mr W last updated on 16/Sep/24

Commented by mr W last updated on 16/Sep/24

Commented by Ari last updated on 16/Sep/24
