If you look at the chart (about the chores) you can find out everthing
For this you need the formula for a circle:
A=πr2 (pi r squared)
A=π(10) squared
A=(3.14)(10) squared
(remember to square before you multiply - order of operations)
A=(3.14)(10*10)
A=(3.14)(100)
A=314
Hope this helps! :)