[the area of a circle]=pi*r² for r=4 ft [the area of a circle]=pi*4²------> 50.24 ft²
if 2π radians ( full circle) has an area of-----------------> 50.24 ft² 5π/2 radians--------------------------------------> X ft ² X=(5π/2)*50.24/2π-------> 62.8 ft²
