Respuesta :

[tex]\\ \bull\sf\dashrightarrow Radius=\dfrac{Diameter}{2}[/tex]

Now

[tex]\\ \bull\sf\dashrightarrow Radius_1=\dfrac{7.8}{2}=3.9[/tex]

[tex]\\ \bull\sf\dashrightarrow Radius_2=\dfrac{8.4}{2}=4.2[/tex]