Question 843804
If the arc length ({{{S}}}) was the circumference ({{{2*pi*R}}}) of the circle, the area ({{{A}}}) of the sector would be the entire area of the circle ({{{pi*R^2}}}). 
Set up a ratio.
{{{S/(2*pi*R)=A/(pi*R^2)}}}
{{{S/2=A/R}}}
{{{A=RS/2=((3.5)(5))/2}}}
where