Apenny has diameter of about 26.5 millimeters. what is the area of a penny to the nearest hundredth? use 3.14 for pi

D=26.5 millimeters
r=13.25 millimeters
A=(pi)(r)^2
A=(3.14)(13.25)^2
A=551.27 millimeters squared

The formula for the diameter of a circle is A=Pi(d/2)^2. So you write 3.14(26.5/2)^2. 26.5 divided by 2 or in half is 13.25. 13.25 times 3.14 is approximately 41.61. 41.61 times 41.61 equals 1,731.3921.So the answer is 1,731.39 millimeters.