Answer:
1) 81.64 ft 2) 12.56 in
Explanation:
a radius is a line halfway through the circle starting in the middle... a diameter is double that, or a line that goes all the way through the circle
you are working with diameter
in order to find the circumference of a circle using diameter, the equation is
C (circumference) = pi x d (diameter)
in order to find the circumference of a circle using radius, the equation is
C = 2 x pi x R (radius)