Question 979529
Find the arc length using the arc length formula.
{{{S=R*theta}}}
Here {{{R}}} is the radius of the circle.
Convert the angle to radians.
{{{theta=140((2pi)/360)=(7pi)/9}}}
So,
{{{S=R*((7pi)/9)}}}
In addition add the radius twice to get the perimeter of the pie slice.
{{{P=R+R+((7pi)/9)}}}
{{{P=(2+(7pi)/9)R}}}