Answer:
1) r = 20.2/2
= 10.1 mm
circumference = ( (1/2) (2) (π) (10.2) )
= 32.04 mm
perimeter = (3.1 + 3.1 + 20.2 + ( (1/2) (2) (π) (10.2) )
= 58.13 mm
2) circumference = (1/4) (2) (π) (307.34)
= 482.77 mm
perimeter = (11.5 + 11.5 + (2 * 10.1) + ( (1/4) (2) (π) (307.34) )
= 525.97 mm
3) circumference = (3/4) (2) (π) (2.5)
= 11.78 cm
4) circumference = (3/4) (2) (π) (2.5)
= 23.56 cm
5) circumference = (1/2) (2) (π) (32)
= 100.53 cm
6) r = 6/2 = 3 cm
circumference = (1/2) (2) (π) (3)
= 9.42 cm
perimeter = (2 + 2 + 6 + ( (1/2) (2) (π) (3) )
= 19.42 cm
I hope my answer helps you.