A circular grass field has a circumference of 120√π meters. if Eric can mow 400 square meters of grass per hour, how many hours will he take to mow the entire few?

Question

A circular grass field has a circumference  of 120√π meters. if Eric can mow 400 square meters of grass per hour, how many hours will he take to mow the entire few?

saifoo.khan · Answer

Steps:

Use the circumference given to find the radius.
Then use that to find the total area.

Then use that area to find the time to be taken by dividing the total area by given area.

3,2,1 Now begin!

anonymous · Answer

thanks so much!!

saifoo.khan · Answer

Cheers! (;

anonymous · Answer

wait but to find the radius do i square the xpression

saifoo.khan · Answer

The formula is:

C = 2 pi*r.            or in other words:        C = pi *d

anonymous · Answer

so it has a circumference  of 120√π meters so do i square that so remove the root sign or is my diameter 120?

saifoo.khan · Answer

Nope, stay it that way.

saifoo.khan · Answer

C = 2* pi*r

120√π = 2* pi * r

60 √π = pi * r

Yes you were correct, 

try it out.

anonymous · Answer

ohhhh thanks!!!

saifoo.khan · Answer

Welcome!