geometry word problems

Question

Mary's dog Cecil is tied to a post by a chain 7 m long. How much play area does this you'll hav is tied to a post by a chain 7 m long. How much play area does cecil have. Round to the nearest square meter

Answer 1

A=∏*r^2 where r=radius and ∏=3.14159 or 22/7

A=3.14159*7^2

A=3.14159*49

A=153.9379

A=154 square meters

 

A=(22/7)(49)

A=22*7

A=154 square meters

sometimes it's convenient to use 22/7 for pi; 22/7 is an acceptable approximation for pi