1) I'm assuming pi equals 3.14
2) I'm also assuming you have to round the number to the nearest tenth
Top Left) 35.2 mm is the circumference
5.6 x 2 = 11.2
11.2 x 3.14 = 35.168
35.168 rounds to 35.2
Top Right) 0.6 cm is the radius
3.8 ÷ 3.14 = 1.210...
1.210... ÷ 2 = 0.605...
0.605... rounds to 0.6
Bottom Left) 1.1 m is the radius
6.8 ÷ 3.14 = 2.165...
2.165... ÷ 2 = 1.082...
1.082... rounds to 1.1
Bottom Right) 14.4 m is the circumference
2.3 x 2 = 4.6
4.6 x 3.14 = 14.444
14.444 rounds to 14.4
Please let me know if I am wrong.