A rope of which a calf is tied is increased from 12 m to 18 m, how much additional grassy ground shall it graze?
Select:  A) 1217  B) 1219  C) 1210  D) 565.7  E) 1312
π (182 – 122) = 565.7   Answer:565.7
<result>D</result>
A rope of which a calf is tied is increased from 12 m to 18 m, how much additional grassy ground shall it graze?