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d=21
l =πd
l = 22/7.21
l = 66
link besar
d= 21+7= 28
l=πd
l = 22/7.28
l = 88
link besar- kecil
88-66
22cm²
luas keseluruhan= phi x r^2
= 22/7 x (21+7):(2)^2
= 22/7 x 14^2
= 616cm^2
luas tidak diarsir= phi x r^2
= 22/7 x 10,5^2
= 346,5cm^2
luas diarsir= 616-346,5= 269,5cm^2