Question: if the circumference of a circle is increased by 50?
Answer: if the circumference of a circle is increased by 50%, it means its radius is increased by 50% and it becomes 2(pi)*1.5r = 3(pi)r. Its area will be (pi)(1.5r)^2= 2.25(pi)r^2. That is, the area increases to 225% or 125% over the first circle.