Find the area of the circle when c=pi/6 .give answer in terms of pi

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?