Question 170090
    a circle has a radius of 10 inch. Find the increase in area that occurs when the radius is increased by 2 inches. Round to the nearest hundredths?
.
Area of a circle is (pi)r^2
.
"area of increased radius circle" - "area of original circle"
.
(pi)(10+2)^2 -  (pi)(10)^2
(pi)(12)^2 -  (pi)(10)^2
pi ((12)^2 - (10)^2)
pi (144 - 100)
pi (44)
(3.14)(44)
138.16 sq inches