Question 102269
I'll answer the 2nd question 1st.
It can graze 3/4 of a circle with a 50' radius.
That area = pi*50^2= 2500*pi*(3/4)= 1875*pi
Of the area not covered it has two 1/4 circles= 1 semicircle with a radius of 30' that area = pi*30^2*.5= 450*pi.
1875*pi + 450*pi = 2325*pi sq. ft. 
Ed