Răspuns:
[tex]R=\dfrac{25}{3}[/tex]
Explicație pas cu pas:
[tex]R=\dfrac{a*b*c}{4*A_{ABC}}[/tex]
[tex]A=\sqrt{p(p-a)(p-b)(p-c)}\\\\p=\dfrac{a+b+c}{2}\\\\p=18\\\\A=\sqrt{18(18-16)(18-10)(18-10)}\\\\A=\sqrt{3^2*2*2*2^3*2^3}\\\\A=\sqrt{3^2*2^8}\\\\A=3*16\\\\A=48\\\\R=\dfrac{\not16*\not10*10}{\not4*\not48}\\\\\R=\dfrac{25}{3}[/tex]