1.
r=5; d=10; C = πd = 3.14*10 = 31.4; S = πr² = 3.14*5² = 3.14*25 = 78.5
2.
d=11; r=11/2 = 5.5; C = 3.14*11 = 34.54; S = 3.14*5.5² = 3.14*30.25 = 94.985
3.
C=56.52; r=56.52/(2*3.14) = 9; d = 9*2 = 18; S = 3.14*9² = 3.14*81 = 254.34
4.
S = 28.26; r = √(28.26/3.14) = √9 = 3; d = 3*2 = 6; С = 3,14*6 = 18,84
5.
S = 0,785; r = √(0,785/3.14) = √0,25 = 0,5; d = 0,5*2 = 1; С = 3,14*1 = 3,14
6.
C=5,024; r=5,024/(2*3.14)=0,8; d=0,8*2=1,6; S=3.14*0,8²=3.14*0,64=2,0096
7.
d=15; r=15/2 = 7.5; C = 3.14*15 = 47,1; S = 3.14*7.5² = 3.14*56.25=176,625