The opening of the jar is a circle.
The area of any circle is (pi) x (radius)²
What's the radius of the jar ?
Well, the diameter is 5 inches.
Radius = 1/2 of the diameter = 2.5 inches.
So Area = (pi) x (2.5 inches)² =
(3.14) x (6.25 square inches) = 19.625 square inches.
