Formula for area is:
A = pi*r^2
r = 28
so...
A = 3.14 * 28^2
A = 3.14 * 784
A = 2461.76 cm^2
Formula for circumference is:
C = 2*pi*r
C = 2*3.14* 28
C = 6.28*28
C = 175.84 cm
Hope this helped!
~Just a girl in love with Shawn Mendes