measure size of school field

1. tools

1.1. metre rule

1.2. measuring tape

1.3. string

1.4. foot steps

1.5. lamp posts

2. purpose

2.1. find area

2.2. find dimensions

2.3. hold sports event

2.4. maintenance cost

3. units

3.1. cm

3.2. m

3.3. km

3.4. mm