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It is: 2 to 3 respectively
The formula for the circumference of a circle is C = 2πr, where C is circumference, π is pi (approx. 3.142), and r is the radius. So, for a circle with a radius of 6cm, C = 2(3.142)(6cm) = 18.852cm Rounding to the proper number of significant figures, this answer would be 20cm.
It does not have a circumference but its perimeter is: 4+6+8 = 18 cm
C = ~37.7 cm A = ~113.1 cm2
6cm equals 60mm